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

<!doctype html>
<html>
<head>
<title>:nth-child with .className selector list argument</title>
<link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
<link rel="match" href="nth-child-of-classname-ref.html">
<style>
p:nth-child(even of .webkit, .fast) {
    background-color: lime;
}
</style>
</head>
<body>
    <p>This test the styling of paragraphs with :nth-child(An+B of selector). If the test succeed, paragraphs that say "green" should have a green background.</p>
    <p class="webkit">White</p>
    <p>White</p>
    <p>White</p>
    <p class="fast">Green!</p>
    <p>White</p>
    <p>White</p>
    <p class="webkit">White</p>
    <p>White</p>
    <p class="webkit">Green!</p>
    <p>White</p>
</body>
</html>