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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1018933
+-->
+<head>
+ <meta charset='utf-8'>
+ <title>Regression test for bug 1018933 - HTMLTrackElement should create only one TextTrack</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">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var video = document.createElement("video");
+video.src = "seek.webm";
+video.preload = "auto";
+
+var trackElement = document.createElement("track");
+trackElement.src = "basic.vtt";
+trackElement.kind = "subtitles";
+
+document.getElementById("content").appendChild(video);
+video.appendChild(trackElement);
+
+// Accessing the track now would have caused the bug as the track element
+// shouldn't have had time to bind to the tree yet.
+trackElement.track.mode = 'showing';
+
+video.addEventListener("loadedmetadata", function run_tests() {
+ // Re-que run_tests() at the end of the event loop until the track
+ // element has loaded its data.
+ if (trackElement.readyState == 1) {
+ setTimeout(run_tests, 0);
+ return;
+ }
+
+ is(video.textTracks.length, 1, "Video should have one TextTrack.");
+ SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>