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diff --git a/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html
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index 0000000000..00b5f9a832
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+++ b/dom/media/mediasource/test/test_SeekableBeforeAndAfterEndOfStreamSplit_mp4.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute after end of stream with split appendBuffer</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/mp4");
+
+  const arrayBuffer = await fetchWithXHR("bipbop/bipbop2s.mp4");
+  info("- append first buffer -");
+  // 25819 is the offset of the first media segment's end
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 25819));
+
+  info("- wait for metadata -");
+  await once(v, "loadedmetadata");
+
+  info("- wait for updateend -");
+  await once(sb, "updateend");
+
+  info("- append second buffer -");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 25819));
+  await once(sb, "updateend");
+
+  info("- check seekable -");
+  const target = 1.3;
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+
+  info("- call end of stream -");
+  ms.endOfStream();
+  await once(ms, "sourceended");
+
+  info("- check seekable -");
+  ok(v.seekable.length, "Resource is seekable");
+  is(v.seekable.start(0), 0, "Seekable's start point is correct");
+  is(v.seekable.end(0), ms.duration, "Seekable's end point is correct");
+  ok(v.seekable.length &&
+     target >= v.seekable.start(0) &&
+     target < v.seekable.end(0), "Target is within seekable range");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>