<!DOCTYPE html>
<html>
<head>
    <style>
        html { overflow: hidden; }
        body { margin: 0px; }
        div { height: 100px; width: 100px; }
        .fixed { position: fixed; }
        .green { background-color: green; }
        .red { background-color: red; }
        .composited { -webkit-transform: translateZ(0); }
    </style>
    <script type="text/javascript">
        if (window.testRunner)
            testRunner.dumpAsText(true);
        function moveFixedDiv()
        {
            document.getElementById('fixedDiv').style.top = '200px';
        }
        window.addEventListener('load', moveFixedDiv, false);
    </script>
</head>
<body style="height:2000px;">
    <!-- You should see 1 green rectangle in the output and no red. -->
    <div style="top: 200px; left: 100px;" class="fixed red"></div>
    <div class="composited"><div id="fixedDiv" style="top: 500px; left:100px;" class="fixed green"></div></div></div>
</body>
</html>