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diff --git a/dom/media/mediasource/test/test_FrameSelection.html b/dom/media/mediasource/test/test_FrameSelection.html
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index 0000000000..3e696841c2
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+++ b/dom/media/mediasource/test/test_FrameSelection.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: verify correct frames selected for given position</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");
+
+  let arrayBuffer = await fetchWithXHR("seek.webm");
+  let p = once(v, "loadedmetadata");
+  // Append entire file covering range [0, 4].
+  sb.appendBuffer(new Uint8Array(arrayBuffer));
+  await p;
+  is(v.currentTime, 0, "currentTime has correct initial value");
+  is(v.videoWidth, 320, "videoWidth has correct initial value");
+  is(v.videoHeight, 240, "videoHeight has correct initial value");
+
+  arrayBuffer = await fetchWithXHR("seek_lowres.webm");
+  // Append initialization segment.
+  info("Appending low-res init segment");
+  p = once(sb, "updateend");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 438));
+  await p;
+
+  info("Appending low-res range [2,4]");
+  // Append media segment covering range [2, 4].
+  p = once(sb, "updateend");
+  sb.appendBuffer(new Uint8Array(arrayBuffer, 51003));
+  await p;
+
+  ms.endOfStream();
+
+  info("Seeking to t=3");
+  p = Promise.all([once(v, "seeked"), once(v, "resize")]);
+  v.currentTime = 3;
+  await p;
+  is(v.currentTime, 3, "Video currentTime at target");
+  is(v.videoWidth, 160, "videoWidth has correct low-res value");
+  is(v.videoHeight, 120, "videoHeight has correct low-res value");
+
+  info("Seeking to t=1");
+  p = Promise.all([once(v, "seeked"), once(v, "resize")]);
+  v.currentTime = 1;
+  await p;
+  is(v.currentTime, 1, "Video currentTime at target");
+  is(v.videoWidth, 320, "videoWidth has correct high-res value");
+  is(v.videoHeight, 240, "videoHeight has correct high-res value");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>