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chromium/third_party/blink/web_tests/compositing/checkerboard.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN"
  "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head>
        <script type="text/javascript">
            function horiz_scroll() {
                if (window.testRunner)
                    testRunner.waitUntilDone();

                var pos = 0;
                var inner = function () {
                    window.scrollTo(pos, 1023);
                    pos += 15;
                    if (pos < 2047)
                        setTimeout(inner, 0);
                    else if (window.testRunner)
                        testRunner.notifyDone();
                };
                inner();
            }
        </script>
    </head>
    <body style="overflow: hidden" onload="horiz_scroll()">
        <div style="will-change: transform;"></div>
        <div style="
            background-image: url('data:image/gif;base64,R0lGODdhAgACAIABAAAAAP///ywAAAAAAgACAAACA0QCBQA7');
            width: 2047px;
            height: 2047px;
        "></div>
    </body>
</html>