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diff --git a/dom/media/mediasource/test/test_SeekToEnd_mp4.html b/dom/media/mediasource/test/test_SeekToEnd_mp4.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seeking to end of data with data gap.</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, el) => {
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 6), ".m4s");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  is(videosb.buffered.length, 1, "continuous buffered range");
+  // Ensure we have at least 2s less audio than video.
+  audiosb.appendWindowEnd = videosb.buffered.end(0) - 2;
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 6), ".m4s");
+  ms.endOfStream();
+  await Promise.all([once(el, "durationchange"), once(ms, "sourceended")]);
+  ok(true, "endOfStream completed");
+  // Seek to the middle of the gap where audio is missing. As we are in readyState = ended
+  // seeking must complete.
+  el.currentTime = videosb.buffered.end(0) / 2 + audiosb.buffered.end(0) / 2;
+  ok(el.currentTime - audiosb.buffered.end(0) >= 1, "gap is big enough");
+  is(el.buffered.length, 1, "continuous buffered range");
+  is(el.buffered.end(0), videosb.buffered.end(0),
+     "buffered range end is aligned with longest track");
+  ok(el.seeking, "element is now seeking");
+  ok(el.currentTime >= el.buffered.start(0) && el.currentTime <= el.buffered.end(0),
+     "seeking time is in buffered range");
+  ok(el.currentTime > audiosb.buffered.end(0),
+     "seeking point is not buffered in audio track");
+  await once(el, "seeked");
+  ok(true, "we have successfully seeked");
+  // Now ensure that we can play to the end, even though we are missing data in one track.
+  el.play();
+  await once(el, "ended");
+  SimpleTest.finish(SimpleTest);
+});
+
+</script>
+</pre>
+</body>
+</html>