<style>
    .box {
        width: 300px;
        height: 300px;
        background-color: red;
        background-position: 50px 50px; 
        background-size: 50px 50px;
        background-repeat: repeat;
}
</style>
<body>
    <h1>This test ensures drawPattern() decodes a new image frame when new encoded data is received.</h1>
    <div class="box"></div>
    <script>
        // The maximum buffering interval for ImageResource is 500ms. Choose stallFor
        // such that the image buffering is disabled in the network process.
        function slowLargeImageSourceURL() {
            return "http://127.0.0.1:8000/resources/load-and-stall.py"
                 + "?name=../../../fast/images/resources/green-400x400.png" 
                 + "&mimeType=image%2Fpng"
                 + "&stallAt=512"
                 + "&stallFor=0.6"
                 + "&stallRepeat=True";
        }

        if (window.testRunner)
            testRunner.waitUntilDone();

        var image = new Image;
        var box = document.querySelector(".box");

        image.src = slowLargeImageSourceURL();

        // Disable the CachedImage buffering as well. This has to happen after setting
        // the src to make sure the Image element has created its CachedImage
        if (window.internals)
            internals.setForceUpdateImageDataEnabledForTesting(image, true);

        box.style.backgroundImage = "url(" + image.src + ")";

        var interval = setInterval(function() {
            if (image.complete) {
                clearInterval(interval);
                testRunner.notifyDone();
            }
            else if (window.testRunner) {
                // Force layout and drawing eveny 100ms.
                document.body.offsetHeight;
                testRunner.display();
            }
        }, 100);
    </script>
</body>