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chromium/third_party/blink/web_tests/external/wpt/html/dom/elements/global-attributes/lang-xyzzy-ref.html 

<!DOCTYPE html>
<title>Invalid languages</title>
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<meta name="flags" content="css21">
<style>#testp { color: green; }</style>
<body>
<div id="test">
<p id="testp" lang="xyzzy">ABC</p>
</div>