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diff --git a/dom/media/mediasource/test/test_MediaSource_mp4.html b/dom/media/mediasource/test/test_MediaSource_mp4.html
new file mode 100644
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+++ b/dom/media/mediasource/test/test_MediaSource_mp4.html
@@ -0,0 +1,90 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script 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();
+
+runWithMSE(async (ms, v) => {
+  SimpleTest.doesThrow(() => new SourceBuffer, "new SourceBuffer should fail");
+  SimpleTest.doesThrow(() => new SourceBufferList, "new SourceBufferList direct should fail");
+
+  ok(ms instanceof EventTarget, "MediaSource must be an EventTarget");
+  is(ms.readyState, "closed", "New MediaSource must be in closed state");
+
+  // Wrapper creation, tests for leaks.
+  SpecialPowers.wrap(ms);
+
+  // Set an expando to force wrapper creation, tests for leaks.
+  ms.foo = null;
+
+  ok(URL.createObjectURL(ms), "Create an objectURL from the MediaSource");
+
+  let loadedmetadataCount = 0;
+  let updatestartCount = 0;
+  let updateendCount = 0;
+  let updateCount = 0;
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  is(ms.readyState, "open", "MediaSource must be in open state after sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+  ok(sb, "Create a SourceBuffer");
+  is(ms.sourceBuffers.length, 1, "MediaSource.sourceBuffers is expected length");
+  is(ms.sourceBuffers[0], sb, "SourceBuffer in list matches our SourceBuffer");
+  is(ms.activeSourceBuffers.length, 0, "MediaSource.activeSourceBuffers is expected length");
+
+  sb.appendBuffer(new Uint8Array(await fetchWithXHR("bipbop/bipbop2s.mp4")));
+  is(sb.updating, true, "SourceBuffer.updating is expected value after appendBuffer");
+
+  sb.addEventListener("update", () => {
+    is(sb.updating, false, "SourceBuffer.updating is expected value in update event");
+    updateCount++;
+    /* Ensure that we endOfStream on the first update event only as endOfStream can
+       raise more if the duration of the last buffered range and the intial duration
+       differ. See bug 1065207 */
+    if (updateCount == 1) {
+      ms.endOfStream();
+    }
+  });
+
+  sb.addEventListener("updatestart", () => updatestartCount++);
+
+  sb.addEventListener("updateend", () => {
+    is(ms.activeSourceBuffers[0], sb, "SourceBuffer in active list matches our SourceBuffer");
+    is(sb.updating, false, "SourceBuffer.updating is expected value in updateend event");
+    updateendCount++;
+    v.play();
+  });
+
+  ms.addEventListener("sourceended", () => {
+    ok(true, "Receive a sourceended event");
+    is(ms.readyState, "ended", "MediaSource must be in ended state after sourceended");
+  });
+
+  v.addEventListener("loadedmetadata", () => loadedmetadataCount++);
+
+  await once(v, "ended");
+  // The bipbop video doesn't start at 0. The old MSE code adjust the
+  // timestamps and ignore the audio track. The new one doesn't.
+  isfuzzy(v.duration, 1.696, 0.166, "Video has correct duration");
+  isfuzzy(v.currentTime, 1.696, 0.166, "Video has correct duration");
+  // XXX: 2 update events can be received dueto duration differences, see bug 1065207.
+  ok(updateCount == 1 || updateCount == 2, "update event received");
+  ok(updateendCount == 1 || updateendCount == 2, "updateend event received");
+  ok(updatestartCount == 1 || updatestartCount == 2, "updatestart event received");
+  is(loadedmetadataCount, 1, "loadedmetadata event received");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>