<!DOCTYPE html>
<html>
<head>
    <style>
        body {
            height: 1500px;
            width: 1500px;
        }

        iframe {
            position: absolute;
            top: 3000px;
        }
        
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function dumpLayers()
        {
            if (window.internals)
                document.getElementById('layers').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS)
        }
        window.addEventListener('load', dumpLayers, false);
    </script>
</head>
<body>
    <iframe src="resources/subframe-with-layers.html" scrolling="nso"></iframe>
    <pre id="layers">Layer tree goes here when testing</pre>
</body>
</html>