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diff --git a/dom/media/mediasource/test/test_SeekableBeforeEndOfStream_mp4.html b/dom/media/mediasource/test/test_SeekableBeforeEndOfStream_mp4.html
new file mode 100644
index 000000000..cc06ff00d
--- /dev/null
+++ b/dom/media/mediasource/test/test_SeekableBeforeEndOfStream_mp4.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute before end of stream</title>
+  <script type="text/javascript" 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(function (ms, v) {
+  ms.addEventListener("sourceopen", function () {
+    var sb = ms.addSourceBuffer("video/mp4");
+
+    fetchWithXHR("bipbop/bipbop2s.mp4", function (arrayBuffer) {
+      sb.appendBuffer(new Uint8Array(arrayBuffer));
+    });
+
+    var target = 1.3;
+
+    v.addEventListener("loadedmetadata", function () {
+      ok(v.seekable.length, "Resource is seekable");
+      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>