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chromium/third_party/blink/web_tests/fast/css/css3-space-in-nth-and-lang.html 

<html>
<head>
    <title>Leading/trailing space in :nth-* and :lang pseudo-classes</title>
    <style type="text/css">
        /* Integer */
        div:nth-child( 1 ) { background-color: yellow; }

        /* Identifier */
        div:nth-child( odd ) { color: green; }
        div:lang( en-GB ) { background-color: silver; }

        /* an+b */
        div:nth-child( 2n ) { color: blue; }
    </style>
</head>

<body>
    <div>Green on Yellow</div>
    <div lang="en-GB">Blue on Silver</div>
    <div>Green</div>
    <div>Blue</div>
    <div>Green</div>
    <div>Blue</div>
</body>
</html>