third_party/blink/web_tests/fenced_frame/basic-expected.html - chromium/src - Git at Google

 <body>
   <iframe
       style="width: 100%; height: 300px; box-sizing: border-box"
       srcdoc="<body style='margin: 0px'><div style='background: red; width: 20px; height: 20px'></div></body>"></iframe>
 </body>
	<body>
	<iframe
	style="width: 100%; height: 300px; box-sizing: border-box"
	srcdoc="<body style='margin: 0px'><div style='background: red; width: 20px; height: 20px'></div></body>"></iframe>
	</body>