third_party/WebKit/LayoutTests/fullscreen/resources/full-screen-iframe-allowed-nested1.html - chromium/src - Git at Google

 <!DOCTYPE html>
 iframe1
 <iframe allowfullscreen src="full-screen-iframe-allowed-nested2.html">
 </iframe>
 <script>
 window.onmessage = function (messageEvent) {
     parent.postMessage(messageEvent.data, "*");
 }
 </script>
	<!DOCTYPE html>
	iframe1
	<iframe allowfullscreen src="full-screen-iframe-allowed-nested2.html">
	</iframe>
	<script>
	window.onmessage = function (messageEvent) {
	parent.postMessage(messageEvent.data, "*");
	}
	</script>