chromium/third_party/blink/manual_tests/plugin-visible-rect-change.html

<p>
    This test requires that accelerated compositing be disabled. Clicking the Test button should completely reveal the black-bordered box.
    The orange video should completely fill the box, with the controller visible and touching the bottom of the box. There should be
    not be any red visible.
</p>
<p>
    <button onclick="test()">Test</button>
</p>
<div style="overflow: hidden; border: solid blue; position: relative;">
    <div style="height: 100px; padding: 0 8px;">
    </div>
    <object type="video/quicktime" style="background-color: red; width: 300px; height: 241px; position: absolute; top: 50px; left: 40px; border: solid black;">
        <param name="src" value="resources/orange.mov">
        <param name="controller" value="true">
        <param name="autoplay" value="false">
        <param name="scale" value="tofit">
    </object>
    <div id="target"></div>
    <script>
        function test()
        {
            document.getElementById("target").style.height = "500px";
        }
    </script>
</div>