src/third_party/web_platform_tests/conformance-checkers/xhtml/elements/base/001-novalid.xhtml - cobalt - Git at Google

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <base/>
 <title>base element missing href and target attribute</title>
 </head>
 <body>
 <iframe sandbox="aLLOw-TOp-nAVIGAtion"></iframe>
 </body>
 </html>
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<base/>
	<title>base element missing href and target attribute</title>
	</head>
	<body>
	<iframe sandbox="aLLOw-TOp-nAVIGAtion"></iframe>
	</body>
	</html>