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diff --git a/dom/media/mediasource/test/test_DurationUpdated.html b/dom/media/mediasource/test/test_DurationUpdated.html
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+++ b/dom/media/mediasource/test/test_DurationUpdated.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: append data and check that mediasource duration got updated</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+var durationChangeCount = 0;
+
+runWithMSE(function (ms, v) {
+  ms.addEventListener("sourceopen", function () {
+    var sb = ms.addSourceBuffer("video/webm");
+
+    v.addEventListener("durationchange", function () {
+      durationChangeCount++;
+    });
+
+    fetchWithXHR("seek.webm", function (arrayBuffer) {
+      sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 318));
+      // Adding the first init segment will fire a durationchange.
+      once(v, "loadedmetadata")
+      .then(function() {
+        ok(true, "got loadedmetadata");
+        // Set mediasource duration to 0, so future appendBuffer
+        // will update the mediasource duration.
+        // Changing the duration will fire a durationchange.
+        ms.duration = 0;
+        sb.appendBuffer(new Uint8Array(arrayBuffer, 318));
+        // Adding more data will fire durationchange.
+        once(sb, "updateend")
+        .then(function() {
+          ok(true, "got updateend");
+          // this will not fire durationchange as new duration == old duration
+          ms.endOfStream();
+        });
+      });
+    });
+  });
+  ms.addEventListener("sourceended", function () {
+    is(durationChangeCount, 3, "durationchange not fired as many times as expected");
+    // XXX: Duration should be exactly 4.0, see bug 1065207.
+    ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+    SimpleTest.finish();
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>