LayoutTests/http/tests/dom/resources/post-message-to-parent-when-loaded.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <body>
 <script>
 onload = () => {
     parent.postMessage("loaded", "*");
 }
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<body>
	<script>
	onload = () => {
	parent.postMessage("loaded", "*");
	}
	</script>
	</body>
	</html>