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

 <html><head><title>iframe test</title></head><body>
   <script type="text/javascript">
 const frame = document.createElement('iframe');
 frame.src = URL.createObjectURL(new Blob(['<html><head></head><body>Hello world!</body>'], { type: 'text/html' }));
 document.body.appendChild(frame);
 </script>
 </body>
 </html>
	<html><head><title>iframe test</title></head><body>
	<script type="text/javascript">
	const frame = document.createElement('iframe');
	frame.src = URL.createObjectURL(new Blob(['<html><head></head><body>Hello world!</body>'], { type: 'text/html' }));
	document.body.appendChild(frame);
	</script>
	</body>
	</html>