third_party/blink/web_tests/external/wpt/lifecycle/resources/subframe.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <meta charset="utf-8">
 <script>
 window.addEventListener('load', () => {
   window.parent.postMessage('load');
 });

 document.addEventListener('freeze', () => {
   window.parent.postMessage('freeze');
 });

 document.addEventListener('resume', () => {
   window.parent.postMessage('resume');
 });

 </script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<script>
	window.addEventListener('load', () => {
	window.parent.postMessage('load');
	});

	document.addEventListener('freeze', () => {
	window.parent.postMessage('freeze');
	});

	document.addEventListener('resume', () => {
	window.parent.postMessage('resume');
	});

	</script>