testing/web-platform/tests/conformance-checkers/html/attributes/lang/extlang-bad-novalid.html


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<!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>