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diff --git a/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html b/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html
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index 000000000..fc3ef06eb
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+++ b/dom/media/mediasource/test/test_HaveMetadataUnbufferedSeek_mp4.html
@@ -0,0 +1,52 @@
+<!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) {
+      // 25819 is the offset of the first media segment's end
+      sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 25819));
+    });
+
+    var target = 1.3;
+
+    v.addEventListener("loadeddata", function onloadeddata() {
+      v.removeEventListener("loadeddata", onloadeddata);
+      ok(v.readyState >= v.HAVE_CURRENT_DATA, "readyState is >= CURRENT_DATA");
+      v.currentTime = target;
+    });
+
+    v.addEventListener("seeking", function () {
+      is(v.readyState, v.HAVE_METADATA, "readyState is HAVE_METADATA");
+      fetchWithXHR("bipbop/bipbop2s.mp4", function (arrayBuffer) {
+        // 25819 is the offset of the first media segment's end
+        sb.addEventListener("updateend", function () {
+          ms.endOfStream();
+        });
+        sb.appendBuffer(new Uint8Array(arrayBuffer, 25819));
+      });
+    });
+
+    v.addEventListener("seeked", function () {
+      SimpleTest.finish();
+    });
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>