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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: data gap detection</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 threshold = 0.5; // gap threshold in seconds.
+  const fuzz = 0.000001; // fuzz when comparing double.
+
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  const vchunks = [{start: 0, end: 3.203333}, { start: 3.203333, end: 6.406666}];
+
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  // We will insert a gap of threshold
+  videosb.timestampOffset = threshold;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
+  // HTMLMediaElement fires 'waiting' if somebody invokes |play()| before the MDSM
+  // has notified it of available data. Make sure that we get 'playing' before
+  // we starting waiting for 'waiting'.
+  info("Invoking play()");
+  let p = once(el, "playing");
+  el.play();
+  await p;
+  await once(el, "waiting");
+  // We're waiting for data after the start of the last frame.
+  // 0.033333 is the duration of the last frame.
+  ok((el.currentTime >= vchunks[1].end - 0.033333 + threshold - fuzz &&
+      el.currentTime <= vchunks[1].end + threshold + fuzz),
+     `skipped the gap properly: ${el.currentTime} ${vchunks[1].end + threshold}`);
+  is(el.buffered.length, 2, "buffered range has right length");
+  // Now we test that seeking will succeed despite the gap.
+  el.currentTime = el.buffered.end(0) + (threshold / 2);
+  await once(el, "seeked");
+  // Now we test that we don't pass the gap.
+  // Clean up our sourcebuffer by removing all data.
+  videosb.timestampOffset = 0;
+  videosb.remove(0, Infinity);
+  el.currentTime = 0;
+  el.pause();
+  await once(videosb, "updateend");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
+  // We will insert a gap of threshold + 1ms
+  videosb.timestampOffset = threshold + 1 / 1000;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
+  info("Invoking play()");
+  p = once(el, "playing");
+  el.play();
+  await p;
+  await once(el, "waiting");
+  // We're waiting for data after the start of the last frame.
+  // 0.033333 is the duration of the last frame.
+  ok((el.currentTime >= vchunks[0].end - 0.033333 - fuzz &&
+      el.currentTime <= vchunks[0].end + fuzz),
+     `stopped at the gap properly: ${el.currentTime} ${vchunks[0].end}`);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>