<!DOCTYPE html>

<html>
<head>
    <style>
        body {
            width: 1200px;
            height: 2000px;
            overflow: hidden;
        }
        
        .box {
            height: 2500px;
            width: 700px;
            -webkit-transform: translateZ(1px);
            background-color: silver;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function doTest()
        {
            if (window.eventSender)
                eventSender.scalePageBy(1.6, 1.6);

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