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Test Info:

<!DOCTYPE html>
<html lang="en-US">
<meta charset="utf-8">
<title>CSS Selectors 4 - :lang matching</title>
<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
<link rel="match" href="lang-000-ref.html">
<style>
div.test { color: red; }
:lang("*-x-foobar") { color: green; }
</style>
<div class="test"><span lang="fr-Latn-FR-x-foobar">This should be green</span></div>