<!DOCTYPE html>

<html>
<head>
    <style>
        body {
            height: 2000px;
        }
        
        .box {
            height: 100px;
            width: 100px;
            background-color: blue;
            margin: 10px;
        }
        
        .composited {
            transform: translateZ(0);
        }
        
        .tiled {
            width: 5000px;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function doTest()
        {
            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="composited box">
    Box
</div>

<div class="tiled composited box">
    Box
</div>

<pre id="layers"></pre>
</body>
</html>