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diff --git a/dom/media/test/test_texttrack_moz.html b/dom/media/test/test_texttrack_moz.html
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+++ b/dom/media/test/test_texttrack_moz.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=881976
+-->
+<head>
+  <meta charset='utf-8'>
+  <title>Test for Bug 881976 - TextTrackCue Computed Position</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();
+  SpecialPowers.pushPrefEnv({"set": [["media.webvtt.regions.enabled", true]]},
+    function() {
+      var video = document.createElement("video");
+
+      // Check if adding a text track manually sets the TextTrackList correctly.
+
+      // HTMLTrackElement.textTrackList is an extension available only to
+      // privileged code, so we need to access it through the SpecialPowers
+      // object.
+      video.addTextTrack("subtitles", "", "");
+      is(SpecialPowers.unwrap(SpecialPowers.wrap(video.textTracks[0]).textTrackList),
+          video.textTracks,
+          "The Track's TextTrackList should be the Video's TextTrackList.");
+
+
+      // Check if loading a Track via a TrackElement sets the TextTrackList correctly.
+      video.src = "seek.webm";
+      video.preload = "auto";
+
+      var trackElement = document.createElement("track");
+      trackElement.src = "basic.vtt";
+      trackElement.kind = "subtitles";
+
+      video.appendChild(trackElement);
+      document.getElementById("content").appendChild(video);
+
+      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 == HTMLTrackElement.LOADING) {
+          setTimeout(run_tests, 0);
+          return;
+        }
+        is(trackElement.readyState, HTMLTrackElement.LOADED,
+            "Track::ReadyState should be set to LOADED.");
+        is(SpecialPowers.unwrap(SpecialPowers.wrap(trackElement.track).textTrackList),
+           video.textTracks,
+           "TrackElement's Track's TextTrackList should be the Video's TextTrackList.");
+
+        SimpleTest.finish();
+      });
+    }
+  );
+</script>
+</pre>
+</body>
+</html>