Remove innerHTML call and replace with textContent (#6916)

* Remove innerHTML call

* Update to innerText

* Update comment to say innerText

* replace innerText with textContent

* Updating comment to textContent

* Add changeset

* Reword changeset

Author: dwyfrequency

.changeset/pretty-carrots-kneel.md

@@ -0,0 +1,5 @@
+---
+'@firebase/database': patch
+---
+
+Replace `innerHTML` call with `textContent`.

packages/database/src/realtime/BrowserPollConnection.ts

@@ -547,8 +547,8 @@ export class FirebaseIFrameScriptHolder {
     if (this.myIFrame) {
       //We have to actually remove all of the html inside this iframe before removing it from the
       //window, or IE will continue loading and executing the script tags we've already added, which
-      //can lead to some errors being thrown. Setting innerHTML seems to be the easiest way to do this.
-      this.myIFrame.doc.body.innerHTML = '';
+      //can lead to some errors being thrown. Setting textContent seems to be the safest way to do this.
+      this.myIFrame.doc.body.textContent = '';
       setTimeout(() => {
         if (this.myIFrame !== null) {
           document.body.removeChild(this.myIFrame);