gecko-dev/dom/html/test/test_track_disabled.html

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HTML

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=833386
-->
<head>
<meta charset='utf-8'>
<title>Test for Bug 833386 - HTMLTrackElement</title>
<script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv({"set": [["media.webvtt.enabled", false]]},
function() {
var track = document.createElement("track");
is(track.constructor, HTMLUnknownElement, "Track should actually be an HTMLUnknownElement.");
SimpleTest.finish();
}
);
</script>
</pre>
</body>
</html>