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diff --git a/dom/media/test/test_mediastream_as_eventarget.html b/dom/media/test/test_mediastream_as_eventarget.html
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index 0000000000..f09c277583
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+++ b/dom/media/test/test_mediastream_as_eventarget.html
@@ -0,0 +1,33 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test MediaStream as EventTarget</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+  <script>
+    var ms = new MediaStream();
+    var listenerForFooWasCalled = false;
+    ms.addEventListener("foo", () => { listenerForFooWasCalled = true; });
+    var listenerForAddTrackWasCalled = false;
+    ms.addEventListener("addtrack", () => { listenerForAddTrackWasCalled = true; });
+    var handlerForAddTrackWasCalled = false;
+    ms.onaddtrack = () => { handlerForAddTrackWasCalled = true; };
+
+    ms.dispatchEvent(new Event("foo"));
+    ms.dispatchEvent(new Event("addtrack"));
+
+    ok(listenerForFooWasCalled,
+       "Should have called the event listener for 'foo'");
+    ok(listenerForAddTrackWasCalled,
+       "Should have called the event listener for 'addtrack'");
+    ok(handlerForAddTrackWasCalled,
+       "Should have called the event handler for 'addtrack'")
+  </script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+</body>
+</html>