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chromium/third_party/blink/web_tests/paint/invalidation/position/fixed.html 

<html>
<head>
    <title></title>
    <script src="../resources/text-based-repaint.js" type="text/javascript"></script>
    <script type="text/javascript">
        window.onload = function() {
            window.scrollTo(0, 20);
            runRepaintAndPixelTest();
        };

        function repaintTest()
        {
            document.getElementById('t').style.background='green';
        }
    </script>
</head>
<body style="height:2000px;">
    <p style="position: absolute; top: 20px;">
        Repaint test for <i><a href="http://bugs.webkit.org/show_bug.cgi?id=11452">http://bugs.webkit.org/show_bug.cgi?id=11452</a>
        REGRESSION (r16736-r16801): Incorrect repaint of fixed boxes</i>.
    </p>
    <div id="t" style="position: fixed; top: 100px; width: 100px; height: 100px; background: red"></div>
</body>
</html>