<!DOCTYPE html>

<html>
<head>
    <style>
        .container {
            height: 150px;
            width: 150px;
            position: relative;
            border: 1px solid black;
            padding: 20px;
            margin: 10px;
            box-sizing: border-box;
            box-shadow: 0 0 4px rgba(0, 0, 0, 0.2);
        }
        
        
        .composited {
            will-change: transform;
        }

        .positioned {
            position: absolute;
            border: 1px solid rgba(0, 0, 0, 0.5);
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        if (window.internals) {
            internals.setFontSmoothingEnabled(true);
            internals.settings.setSubpixelAntialiasedLayerTextEnabled(true)
        }

        function doTest()
        {

            if (window.internals)
                document.getElementById('layers').innerText = internals.layerTreeAsText(document);
        }

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

<div class="composited container">
    <div class="positioned">
        This layer should get smoothing.
    </div>
</div>
<pre id="layers"></pre>

</body>
</html>