testing/web-platform/tests/conformance-checkers/html/attributes/lang/xmllang-same-isvalid.html


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<!DOCTYPE html>
<html xml:lang="en" lang="en">
<head>
<meta charset=utf-8>
<title>When "xml:lang" is specified, the element must also have "lang" present with the same value</title>
</head>
<body>
<p></p>
</body>
</html>