LayoutTests/fast/animation/resources/requestAnimationFrame-frame.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <body>
 <iframe id="grandChildFrame" src="requestAnimationFrame-frame-2.html"></iframe>
 <script>

 var i = 0;
 function step()
 {
   i++;
   requestAnimationFrame(step);
 }

 requestAnimationFrame(step);
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<body>
	<iframe id="grandChildFrame" src="requestAnimationFrame-frame-2.html"></iframe>
	<script>

	var i = 0;
	function step()
	{
	i++;
	requestAnimationFrame(step);
	}

	requestAnimationFrame(step);
	</script>
	</body>
	</html>