<!DOCTYPE html> <!-- webkit-test-runner [ useAcceleratedDrawing=true ] -->

<html>
<head>
    <style>
        .container {
            position: relative;
            height: 200px;
            width: 200px;
            margin: 10px;
            padding: 10px;
            border: 1px solid black;
            will-change: transform;
        }
    </style>
    <script>
        var jsTestIsAsync = true;

        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
            window.testRunner.overridePreference("WebKitUsesPageCachePreferenceKey", 1);
        }
        
        function doOnFirstLoad()
        {
            if (window.internals)
                document.getElementById('layers-before-navigate').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_ACCELERATES_DRAWING);
            
            setTimeout(function() {
                window.location.href = 'resources/go-back.html';
            }, 0);
        }

        function doAfterBack()
        {
            if (window.internals)
                document.getElementById('layers-after-back').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_ACCELERATES_DRAWING);

            if (window.testRunner)
                testRunner.notifyDone();
        }

        window.addEventListener("pageshow", function(event) {
            if (event.persisted)
                setTimeout(doAfterBack, 0);
        }, false);

        function doTest()
        {
            doOnFirstLoad();
        }
        
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>
<div class="container">
    <p>This layer should use 'acceleratesDrawing' after going back to this page.</p>
</div>
<h2>Before:</h2>
<pre id="layers-before-navigate"></pre>
<h2>After:</h2>
<pre id="layers-after-back"></pre>

</body>
</html>