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diff --git a/dom/media/mediasource/test/test_LiveSeekable.html b/dom/media/mediasource/test/test_LiveSeekable.html
new file mode 100644
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+++ b/dom/media/mediasource/test/test_LiveSeekable.html
@@ -0,0 +1,76 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: live seekable range</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");
+
+  // Load data with a +2 offset so that we can distinguish buffered range start
+  // and seekable range start.
+  sb.timestampOffset = 2;
+  const p = once(v, "loadedmetadata");
+  await fetchAndLoad(sb, "seek", [""], ".webm");
+  await p;
+  ms.duration = Infinity;
+  sb.abort();
+  is(sb.buffered.length, 1, "continuous buffered range");
+  is(sb.buffered.start(0), 2, "buffered range start at timestamp offset");
+  is(sb.buffered.end(0), 6.001, "buffered range end at original duration + timestamp offset");
+  is(v.seekable.length, 1, "continuous seekable range");
+  is(v.seekable.start(0), 0, "seekable range start at 0");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  // LiveSeekableRange.start < buffered.start
+  ms.setLiveSeekableRange(1, 5);
+  is(v.seekable.length, 1, "continuous seekable range");
+  is(v.seekable.start(0), 1, "seekable range start at live range start");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  ms.clearLiveSeekableRange();
+  is(v.seekable.length, 1, "continuous seekable range");
+  is(v.seekable.start(0), 0, "seekable range start at 0");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  // LiveSeekableRange.end > buffered.end
+  ms.setLiveSeekableRange(1, 8);
+  is(v.seekable.start(0), 1, "seekable range start at live range start");
+  is(v.seekable.end(0), 8, "seekable range end at live range end");
+
+  // LiveSeekableRange.start > buffered.start
+  // LiveSeekableRange.end < buffered.end
+  ms.setLiveSeekableRange(3, 5);
+  is(v.seekable.start(0), sb.buffered.start(0), "seekable range start at buffered start");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at live range end");
+
+  // LiveSeekableRange.start > buffered.end
+  ms.setLiveSeekableRange(8, 10);
+  is(v.seekable.start(0), sb.buffered.start(0), "seekable range start at buffered start");
+  is(v.seekable.end(0), 10, "seekable range end at live range end");
+
+  // LiveSeekableRange.end < buffered.start
+  ms.setLiveSeekableRange(0, 2);
+  is(v.seekable.start(0), 0, "seekable range start at live range start");
+  is(v.seekable.end(0), sb.buffered.end(0), "seekable range end at buffered end");
+
+  must_throw(() => ms.setLiveSeekableRange(2, 0),
+             "must thow if start > end",
+             "TypeError");
+
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>