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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: check that duration change behaves properly</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) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/webm");
+
+  const arrayBuffer = await fetchWithXHR("seek.webm");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 318));
+  await Promise.all([once(v, "loadedmetadata"), once(sb, "updateend")]);
+  is(v.duration, ms.duration, "video duration is mediasource one");
+  must_not_throw(() => ms.duration = 0, "duration = 0 is valid initially");
+  is(v.duration, 0, "reducing duration with no data buffered is valid");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 318));
+  // Adding more data will fire durationchange.
+  await once(sb, "updateend");
+  ok(true, "got updateend");
+  // XXX: Duration should be exactly 4.0, see bug 1065207.
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  must_throw(() => ms.duration = 0,
+             "Must use remove for range removal",
+             "InvalidStateError");
+  ok(Math.abs(v.duration - 4) <= 0.002, "Video has correct duration");
+  must_not_throw(() => ms.duration = 10, "setting duration past data is valid");
+  is(v.duration, 10, "extending duration is always valid");
+  // The last sample has a start time of 3.967000s and a end time of 4.001 (see bug 1065207).
+  must_not_throw(() => ms.duration = 3.967000,
+                 "setting duration with >= highest frame presentation time is valid");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  must_not_throw(() => ms.duration = 3.97,
+                 "setting duration with >= highest frame presentation time is valid");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  must_throw(() => ms.duration = 3.96,
+             "setting duration with < highest frame presentation time is not valid",
+             "InvalidStateError");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  must_throw(() => ms.duration = -1, "can't set a negative duration", "TypeError");
+  sb.remove(sb.buffered.end(0), Infinity);
+  is(sb.updating, true, "updating is true");
+  must_throw(() => ms.duration = Infinity,
+             "setting the duration while updating is not allowed",
+             "InvalidStateError");
+  must_throw(() => sb.abort(),
+             "Can't use abort while range removal is in progress",
+             "InvalidStateError");
+  is(v.duration, sb.buffered.end(0),
+     "duration is the highest end time reported by the buffered attribute ");
+  await once(sb, "updateend");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>