chrome/test/data/page_load_metrics/dynamic_iframe.html - chromium/src - Git at Google

 <html>
   <link rel="stylesheet" href="seamless-iframe.css">
   <body>
     <script>
       var iframe = document.createElement('iframe');
       iframe.className = 'seamless';
       document.body.appendChild(iframe);
       var doc = iframe.contentDocument;
       doc.open();
       doc.write('<html><body>Hello, world!</body></html>');
       doc.close();
     </script>
   </body>
 </html>
	<html>
	<link rel="stylesheet" href="seamless-iframe.css">
	<body>
	<script>
	var iframe = document.createElement('iframe');
	iframe.className = 'seamless';
	document.body.appendChild(iframe);
	var doc = iframe.contentDocument;
	doc.open();
	doc.write('<html><body>Hello, world!</body></html>');
	doc.close();
	</script>
	</body>
	</html>