<!DOCTYPE html>

<html>
<head>
    <style>
        .box {
            height: 100px;
            width: 100px;
            background-image: -webkit-repeating-linear-gradient(red 10%, green 10%, green 30%);
            background-attachment: fixed; /* At this time, background-attachment:fixed forces slow mode. */
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function doTest()
        {
            if (window.internals) {
                document.getElementById('layers').innerText = internals.scrollingStateTreeAsText();
            }
        }
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>
<div class="box">
</div>
<pre id="layers">Scrolling tree goes here</p>
</body>
</html>