<!DOCTYPE html>

<html>
<head>
    <style>
        html {
            background-color: silver;
        }
        body {
            margin: 100px;
            height: 1500px;
            background-image: url('../../../compositing/resources/simple_image.png');
            background-size: 200px 200px;
            background-attachment: fixed;
        }
        
        .test {
            height: 400px;
            width: 600px;
            background-color: rgba(0, 0, 0, 0.5);
            border: 20px solid orange;
        }
        
        #layers {
            opacity: 0;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText(true);
        
        function doTest()
        {
            window.scrollTo(0, 200);

            if (window.internals)
                document.getElementById('layers').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_TILE_CACHES);
        }
        
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>

    <div class="test"></div>
<pre id="layers"></pre>
</body>
</html>