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chromium/third_party/blink/web_tests/external/wpt/css/selectors/nth-child-of-nesting-ref.html 

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<html>
<body>
    <p>White</p>
    <p style="background-color: lime">Green</p>
    <p>White</p>
    <p>White</p>
    <p>White</p>
    <p style="background-color: lime">Green</p>
    <p>White</p>
    <p>White</p>
    <p>White</p>
    <p style="background-color: lime">Green</p>
    <p>White</p>
    <p>White</p>
</body>
</html>