<!DOCTYPE html>

<html>
<head>
    <style>
        body {
            overflow: hidden;
        }
        
        .container {
            position: relative;
            height: 200px;
            width: 200px;
            border: 2px solid black;
            margin: 10px;
            overflow: hidden;
            -webkit-perspective: 600px;
        }
        .box {
            position: absolute;
            height: 200px;
            width: 200px;
            background-color: red;
            border: 1px solid black;
            -webkit-backface-visibility: hidden;
            -webkit-transform-style: preserve-3d;
            -webkit-transform: rotateY(180deg);
        }
        
        .tiled {
            height: 2500px;
        }
        
        #layers {
            opacity: 0; /* Hide from pixel result */
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText(true);
        
        function dumpLayers()
        {
            if (window.internals)
                document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);
        }
        window.addEventListener('load', dumpLayers, false);
    </script>
</head>
<body>
    <!-- You should see two empty white squares. -->
    <div class="container">
        <div class="box"></div>
    </div>
    <div class="container">
        <div class="tiled box">
        </div>
    </div>

<pre id="layers">Layers go here</pre>
</body>
</html>