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diff --git a/dom/media/mediasource/test/test_SeekNoData_mp4.html b/dom/media/mediasource/test/test_SeekNoData_mp4.html
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+++ b/dom/media/mediasource/test/test_SeekNoData_mp4.html
@@ -0,0 +1,57 @@
+<!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) => {
+  el.controls = true;
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const audiosb = ms.addSourceBuffer("audio/mp4");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  el.addEventListener("error", e => {
+    ok(false, `should not fire ${e.type} event`);
+    SimpleTest.finish();
+  });
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  must_not_throw(() => el.currentTime = 3, "setting currentTime is valid");
+  is(el.currentTime, 3, "currentTime is default playback start position");
+  is(el.seeking, false, "seek not started with HAVE_NOTHING");
+  await Promise.all([
+    fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4"),
+    fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4"),
+    once(el, "loadedmetadata"),
+  ]);
+  const p = once(el, "seeking");
+  el.play();
+  el.currentTime = 5;
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  is(el.seeking, true, "seek not started with HAVE_METADATA");
+  is(el.currentTime, 5, "currentTime is seek position");
+  await p;
+  ok(true, "Got seeking event");
+  await Promise.all([
+    once(el, "seeked"),
+    fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(5, 9), ".m4s"),
+    fetchAndLoad(videosb, "bipbop/bipbop_video", range(6, 10), ".m4s"),
+  ]);
+  ok(true, "Got seeked event");
+  ok(el.currentTime >= 5, "Time >= 5");
+  ms.endOfStream();
+  await once(el, "ended");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>