<!DOCTYPE html>

<html>
<head>
<style>
    .container {
        width: 100px;
        height: 100px;
        border: 1px solid black;
        -webkit-perspective: 500px;
        
    }
    .box {
        width: 100px;
        height: 100px;
        margin: 10px;
        padding: 10px;
        box-sizing: border-box;
        background-color: silver;
        -webkit-transform: translateZ(100px);
        -webkit-transform-style: preserve-3d;
    }
</style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function doTest()
        {
            if (window.internals)
                document.getElementById('layers').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS)
        }
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>

    <div class="container">
        <div class="box">Box
            <div class="box">Box</div>
        </div>
    </div>

    <pre id="layers">Layer tree goes here when testing</pre>
</body>
</html>