event: cancelBubble is a property

Event#cancelBubble is property (and not a function). Change
Event#cancelBubble to a property and add a test.

PR-URL: #33613
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Juan José Arboleda <[email protected]>

PR-URL: #34015
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>

Author: benjamingr

test/parallel/test-eventtarget.js

@@ -70,6 +70,24 @@ ok(EventTarget);
   const ev = new Event('foo', {}, {});
   strictEqual(ev.type, 'foo');
 }
+{
+const ev = new Event('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.cancelBubble = true;
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new Event('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.stopPropagation();
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new Event('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.cancelBubble = 'some-truthy-value';
+  strictEqual(ev.cancelBubble, true);
+}
 {
   const ev = new Event('foo', { cancelable: true });
   strictEqual(ev.type, 'foo');