<!DOCTYPE html>

<html>
<head>
    <style>
        .container {
            position: relative;
            z-index: 1;
            padding: 10px;
            width: 400px;
            height: 400px;
            border: 1px solid black;
        }

        input, textarea {
            position: absolute;
            border-style: none;
            outline: 0;
            height: 20px;
            width: 200px;
            background: silver;
        }
        
        .composited {
            position: absolute;
            left: 10px;
            width: 20px;
            height: 100%;
            -webkit-transform: translateZ(0);
            background-color: #eee;
        }
    </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="container">
    <div class="composited"></div>

    <input type="text" style="top: 10px"></input>
    <textarea style="top: 50px"></textarea>
</div>

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

</body>
</html>