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diff --git a/dom/media/mediasource/test/test_SeekedEvent_mp4.html b/dom/media/mediasource/test/test_SeekedEvent_mp4.html
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index 0000000000..70401f1eb1
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+++ b/dom/media/mediasource/test/test_SeekedEvent_mp4.html
@@ -0,0 +1,48 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: Check that seeked event is fired prior loadeddata</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) => {
+  el.controls = true;
+  const events = ["seeked", "loadeddata", "playing"];
+  let eventCount = 0;
+  events.forEach(type => el.addEventListener(type,
+      () => is(events[eventCount++], type, "events must come in order")));
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  el.play();
+  videosb.timestampOffset = 2;
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // Load [2, 3.606).
+  p = once(el, "play");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["1"], ".m4s");
+  await p;
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["2"], ".m4s");
+  // TODO: readyState should be at least HAVE_CURRENTDATA, see bug 1367993.
+  ok(el.readyState >= el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  el.currentTime = 2;
+  await Promise.all([once(el, "seeked"), once(el, "playing")]);
+  ok(true, "completed seek");
+  is(eventCount, events.length, "Received expected number of events");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>