<!DOCTYPE html>

<html>
<head>
    <style>
        .box {
            height: 42px;
            width: 44px;
            background-color: blue;
            -webkit-mask-image: url(data:image/png;base64,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);
        }
        .composited {
            -webkit-transform: translateZ(0);
        }
    </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 | internals.LAYER_TREE_INCLUDES_CONTENT_LAYERS)
        }

        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>
<div class="composited box"></div>
<pre id="layers">Layer tree goes here when testing</pre>
</body>
</html>