<!DOCTYPE html>

<html>
<head>
    <style>
        #resizing {
            width: 400px;
            border: 1px solid black;
            -webkit-transform: translateZ(0);
        }

        #resizing > div {
            height: 50px;
            margin: 1px;
            background-color: silver;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();
        
        function doTest()
        {
            // Force compositing update before changing layer size.
            if (window.internals)
                window.internals.layerTreeAsText(document);

            var resizingDiv = document.getElementById('resizing');
            
            for (var i = 0; i < 2; ++i) {
                var newDiv = document.createElement('div');
                resizingDiv.appendChild(newDiv);
            }

            if (window.internals)
                window.internals.startTrackingRepaints();

            for (var i = 0; i < 2; ++i) {
                var newDiv = document.createElement('div');
                resizingDiv.appendChild(newDiv);
            }

            if (window.internals)
                document.getElementById('layers').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
        }

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

<div id="resizing"></div>
<pre id="layers"></pre>

</body>
</html>