LayoutTests/fast/frames/resources/child-iframe-forces-parent-layout-on-unload.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <script>
     function leave() {
         var e = parent.document.getElementById("resizeThis");
         e.setAttribute("style", "height: 50px");
         e.offsetTop;
     }
 </script>
 </head>
 <body onunload='leave();'></body>
 <html>
	<!DOCTYPE html>
	<html>
	<head>
	<script>
	function leave() {
	var e = parent.document.getElementById("resizeThis");
	e.setAttribute("style", "height: 50px");
	e.offsetTop;
	}
	</script>
	</head>
	<body onunload='leave();'></body>
	<html>