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diff --git a/dom/media/mediasource/test/test_MultipleInitSegments_mp4.html b/dom/media/mediasource/test/test_MultipleInitSegments_mp4.html
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index 0000000000..47c115677d
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+++ b/dom/media/mediasource/test/test_MultipleInitSegments_mp4.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: Append buffer with multiple init segments</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 init = new Uint8Array(await fetchWithXHR("bipbop/bipbop_videoinit.mp4"));
+  const segment1 = new Uint8Array(await fetchWithXHR("bipbop/bipbop_video1.m4s"));
+  const segment2 = new Uint8Array(await fetchWithXHR("bipbop/bipbop_video2.m4s"));
+  const data = [init, segment1, init, segment2];
+  const length = data.map(d => d.byteLength).reduce((a, b) => a + b, 0);
+  const arrayBuffer = new Uint8Array(length);
+  let pos = 0;
+  for (const buffer of data) {
+    arrayBuffer.set(buffer, pos);
+    pos += buffer.byteLength;
+  }
+  await loadSegment(sb, arrayBuffer);
+  // Since we are passing multiple segments in one buffer,
+  // the first durationchange event from parsing the init
+  // segment will be fired before updateend.
+  const p = once(v, "durationchange");
+  ms.endOfStream();
+  await p;
+  ok(v.duration, 1.601666);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>