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chromium/third_party/blink/web_tests/external/wpt/css/selectors/i18n/lang-pseudo-class-across-shadow-boundaries-ref.html 

<!DOCTYPE html>
<html>
    <body>
        <p>Test passes if you see a single 100px by 100px green box below.</p>
        <div style="width: 100px; height: 100px; background: green;"></div>
    </body>
</html>