chrome/test/data/previews/iframe_blank.html - chromium/src - Git at Google

 <html><head><title>Blank iframe test</title></head>
 <body>
 <iframe src="https://example.com" name="subframe"></iframe>
 </body></html>
	<html><head><title>Blank iframe test</title></head>
	<body>
	<iframe src="https://example.com" name="subframe"></iframe>
	</body></html>