LayoutTests/fast/eventloop/data-uri-document-has-its-own-event-loop.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <body>
 <script src="../../resources/js-test-pre.js"></script>
 <script>

 description('This tests that each data URI document has its own unique event loop');

 if (!window.internals)
     testFailed('This test relies on window.internals');
 else {
     jsTestIsAsync = true;

     childFrame = document.createElement('iframe');
     document.body.appendChild(childFrame);

     childFrame.src = `data:text/html,<!DOCTYPE html>
     <body onload="parent.postMessage(internals.hasSameEventLoopAs(nestedFrame.contentWindow), '*')">
     <iframe id="nestedFrame" src="data:text/html,<!DOCTYPE html>">`;

     onmessage = (event) => {
         window.nestedFrameWithDataURLHasSameEventLoopAsParent = event.data;
         shouldBeFalse('internals.hasSameEventLoopAs(childFrame.contentWindow)');
         shouldBeFalse('nestedFrameWithDataURLHasSameEventLoopAsParent');
         finishJSTest();
     }
 }

 successfullyParsed = true;

 </script>
 <script src="../../resources/js-test-post.js"></script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<body>
	<script src="../../resources/js-test-pre.js"></script>
	<script>

	description('This tests that each data URI document has its own unique event loop');

	if (!window.internals)
	testFailed('This test relies on window.internals');
	else {
	jsTestIsAsync = true;

	childFrame = document.createElement('iframe');
	document.body.appendChild(childFrame);

	childFrame.src = `data:text/html,<!DOCTYPE html>
	<body onload="parent.postMessage(internals.hasSameEventLoopAs(nestedFrame.contentWindow), '*')">
	<iframe id="nestedFrame" src="data:text/html,<!DOCTYPE html>">`;

	onmessage = (event) => {
	window.nestedFrameWithDataURLHasSameEventLoopAsParent = event.data;
	shouldBeFalse('internals.hasSameEventLoopAs(childFrame.contentWindow)');
	shouldBeFalse('nestedFrameWithDataURLHasSameEventLoopAsParent');
	finishJSTest();
	}
	}

	successfullyParsed = true;

	</script>
	<script src="../../resources/js-test-post.js"></script>
	</body>
	</html>