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+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</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 sb = ms.addSourceBuffer("video/webm");
+  sb.addEventListener("error", e => {
+    ok(false, "Got Error: " + e);
+    SimpleTest.finish();
+  });
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 0, 318));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 318, 25223 - 318));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 25223, 46712 - 25223));
+  /* Note - Missing |46712, 67833 - 46712| segment here */
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 67833, 88966 - 67833));
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 88966));
+  // 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;
+  ok(true, "Video playing. It should play for a bit, then fire 'waiting'");
+  p = once(el, "waiting");
+  el.play();
+  await p;
+  // currentTime is based on the current video frame, so if the audio ends just before
+  // the next video frame, currentTime can be up to 1 frame's worth earlier than
+  // min(audioEnd, videoEnd).
+  // 0.0465 is the length of the last audio frame.
+  ok(el.currentTime >= (sb.buffered.end(0) - 0.0465),
+     `Got a waiting event at ${el.currentTime}`);
+  info("Loading more data");
+  p = once(el, "ended");
+  await loadSegment(sb, new Uint8Array(arrayBuffer, 46712, 67833 - 46712));
+  ms.endOfStream();
+  await p;
+  // These fuzz factors are bigger than they should be. We should investigate
+  // and fix them in bug 1137574.
+  isfuzzy(el.duration, 4.001, 0.1, "Video has correct duration: " + el.duration);
+  isfuzzy(el.currentTime, el.duration, 0.1, "Video has correct currentTime.");
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>