<!DOCTYPE html>

<html>
<head>
    <style>
        body {
            width: 1200px;
            height: 2000px;
            /* The setBackgroundShouldExtendBeyondPage setting will only create margin tiles for documents
               that have background images. */
            background-image:url(resources/greenbox.png);
            background-repeat:repeat;
        }
    </style>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }

        function doTest()
        {
            if (window.internals)
                window.internals.settings.setBackgroundShouldExtendBeyondPage(true);

            // FrameView::enableSpeculativeTilingIfNeeded() uses a 0.5s timer to enable speculative tiling.
            window.setTimeout(function() {
                if (window.internals) {
                    document.getElementById('layers').innerText = internals.layerTreeAsText(document,
                        internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS | internals.LAYER_TREE_INCLUDES_TILE_CACHES);
                }
                
                if (window.testRunner)
                    testRunner.notifyDone();
            }, 550);
        }
        window.addEventListener('load', doTest, false);
    </script>
</head>

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