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chromium/third_party/blink/web_tests/external/wpt/css/css-scoping/reference/green-box.html 

<!DOCTYPE html>
<html>
<head>
    <title>CSS Scoping Module Level 1 - A green box reference</title>
    <link rel="author" title="Ryosuke Niwa" href="mailto:[email protected]"/>
</head>
<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>