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+<!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, el) => {
+  const eps = 0.01;
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  // We divide the video into 3 chunks:
+  // chunk 0: segments 1-4
+  // chunk 1: segments 5-8
+  // chunk 2: segments 9-13
+  // We then fill the timeline so that it seamlessly plays the chunks in order 0, 2, 1.
+  const vchunks = [{start: 0, end: 3.2033},
+                    { start: 3.2033, end: 6.4066},
+                    { start: 6.4066, end: 10.01}];
+  const firstvoffset = vchunks[2].end - vchunks[2].start; // Duration of chunk 2
+  const secondvoffset = -(vchunks[1].end - vchunks[1].start); // -(Duration of chunk 1)
+
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  is(videosb.buffered.length, 1, "No discontinuity");
+  isfuzzy(videosb.buffered.start(0), vchunks[0].start, eps, "Chunk start");
+  isfuzzy(videosb.buffered.end(0), vchunks[0].end, eps, "Chunk end");
+  videosb.timestampOffset = firstvoffset;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
+  is(videosb.buffered.length, 2, "One discontinuity");
+  isfuzzy(videosb.buffered.start(0), vchunks[0].start, eps, "First Chunk start");
+  isfuzzy(videosb.buffered.end(0), vchunks[0].end, eps, "First chunk end");
+  isfuzzy(videosb.buffered.start(1), vchunks[1].start + firstvoffset, eps, "Second chunk start");
+  isfuzzy(videosb.buffered.end(1), vchunks[1].end + firstvoffset, eps, "Second chunk end");
+  videosb.timestampOffset = secondvoffset;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(9, 14), ".m4s");
+  is(videosb.buffered.length, 1, "No discontinuity (end)");
+  isfuzzy(videosb.buffered.start(0), vchunks[0].start, eps, "Chunk start");
+  isfuzzy(videosb.buffered.end(0), vchunks[2].end, eps, "Chunk end");
+  audiosb.timestampOffset = 3;
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 12), ".m4s");
+  is(audiosb.buffered.length, 1, "No audio discontinuity");
+  isfuzzy(audiosb.buffered.start(0), 3, eps, "Audio starts at 3");
+
+  // Trim the rest of the audio.
+  audiosb.remove(videosb.buffered.end(0), Infinity);
+  videosb.remove(videosb.buffered.end(0), Infinity);
+  if (audiosb.updating) {
+    await once(audiosb, "updateend");
+  }
+  if (videosb.updating) {
+    await once(videosb, "updateend");
+  }
+  info("waiting for play to complete");
+  el.play();
+  el.currentTime = el.buffered.start(0);
+  ms.endOfStream();
+  await Promise.all([once(el, "ended"), once(el, "seeked")]);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>