LayoutTests/media/remove-from-document.html

<video controls autoplay></video>
<p>Test that removing a media element from the tree pauses playback but does not unload the media.</p>
<script src=video-test.js></script>
<script>
    waitForEvent('load', function () {

        testExpected("video.networkState", HTMLMediaElement.NETWORK_LOADED);
        testExpected("video.paused", false);

        run("document.body.removeChild(video)");

        testExpected("video.networkState", HTMLMediaElement.NETWORK_LOADED);
        testExpected("video.paused", true);

        document.body.offsetTop;
        endTest();
    } );

video.src = "content/test.mp4";
</script>