<!DOCTYPE html>

<html>
<head>
    <style>
        .container {
            padding: 10px;
            border: 2px solid black;
        }
        .box {
            height: 100px;
            width: 100px;
            background-color: blue;
        }
        
        .composited {
            -webkit-transform: translateZ(0);
        }
        
        .rounded {
            border-radius: 50%;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function dumpLayers()
        {
            var layersResult = document.getElementById('layers');
            if (window.testRunner)
                layersResult.innerText = window.internals.layerTreeAsText(document);
        }

        window.addEventListener('load', dumpLayers, false)
    </script>
</head>
<body>

    <div class="composited rounded container">
        <div class="composited box">
        </div>
    </div>

<div class="composited rounded box">
</div>

<pre id="layers">Layer tree goes here in DRT</pre>
</body>
</html>