LayoutTests/media/constructors.html

<body>
<p>Test that media constructors behave consistently.</p>
<video></video>
<audio></audio>
<script src=video-test.js></script>
<script>
    var audioJS = new Audio();
    var videoElem = document.getElementsByTagName('video')[0];
    var audioElem = document.getElementsByTagName('audio')[0];
    testExpected("audioJS instanceof HTMLAudioElement", true);
    testExpected("audioJS instanceof HTMLMediaElement", true);
    testExpected("audioJS instanceof HTMLVideoElement", false);
    testExpected("audioElem instanceof HTMLAudioElement", true);
    testExpected("audioElem instanceof HTMLMediaElement", true);
    testExpected("audioElem instanceof HTMLVideoElement", false);
    testExpected("videoElem instanceof HTMLVideoElement", true);
    testExpected("videoElem instanceof HTMLMediaElement", true);
    testExpected("videoElem instanceof HTMLAudioElement", false);
    endTest();
</script>