src/third_party/web_platform_tests/conformance-checkers/html/attributes/lang/extlang-bad-novalid.html - cobalt - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <title>must be a valid BCP 47 language tag, or the empty string</title>
 <meta charset=utf-8>
 </head>
 <body lang=bat-smg><!-- bad extlang -->
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>must be a valid BCP 47 language tag, or the empty string</title>
	<meta charset=utf-8>
	</head>
	<body lang=bat-smg><!-- bad extlang -->
	</body>
	</html>