third_party/blink/web_tests/fast/loader/document-write-during-onload-still-finishes.html - chromium/src - Git at Google

 <html>
 <head>
 <script>
 if (window.testRunner)
     testRunner.dumpAsText();

 function loaded()
 {
     document.querySelector('#frame').contentDocument.write("We pass if we don't timeout");
 }
 </script>
 </head>
 <body onload="loaded();">
 <iframe id="frame"></iframe>
 </body>
 </html>
	<html>
	<head>
	<script>
	if (window.testRunner)
	testRunner.dumpAsText();

	function loaded()
	{
	document.querySelector('#frame').contentDocument.write("We pass if we don't timeout");
	}
	</script>
	</head>
	<body onload="loaded();">
	<iframe id="frame"></iframe>
	</body>
	</html>