<!DOCTYPE html>
<title>Invalid languages</title>
<link rel="match" href="lang-xyzzy-ref.html">
<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-lang-and-xml:lang-attributes">
<link tel="help" href="http://www.w3.org/TR/CSS2/selector.html#lang">
<meta name="flags" content="css21">
<style>:lang(xyzzy) { color: green; }</style>
<body>
<div id="test">
<p id="testp" lang="xyzzy">ABC</p>
</div>