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diff --git a/dom/media/test/test_delay_load.html b/dom/media/test/test_delay_load.html
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+++ b/dom/media/test/test_delay_load.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=479711
+-->
+<head>
+  <title>Test for Bug 479711</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="text/javascript" src="manifest.js"></script>
+  <script>
+
+  var gRegisteredElements = [];
+  var testWindows = [];
+
+  function register(v) {
+    gRegisteredElements.push(v);
+  }
+
+  function loaded() {
+    info("onload fired!");
+
+    for (var i = 0; i < gRegisteredElements.length; ++i) {
+      var v = gRegisteredElements[i];
+      ok(v.readyState >= v.HAVE_CURRENT_DATA,
+         v._name + ":" + v.id + " is not ready before onload fired (" + v.readyState + ")");
+    }
+
+    for (i=0; i<testWindows.length; ++i) {
+      testWindows[i].close();
+    }
+
+    mediaTestCleanup();
+
+    SimpleTest.finish();
+  }
+
+  addLoadEvent(loaded);
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=479711">Mozilla Bug 479711</a>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 479711 **/
+
+function createVideo(name, type, id) {
+  var v = document.createElement("video");
+  v.preload = "metadata";
+  // Make sure each video is a unique resource
+  v.src = name + "?" + id;
+  v._name = name;
+  v.id = id;
+  register(v);
+  return v;
+}
+
+var test = getPlayableVideo(gSmallTests);
+
+// Straightforward add, causing a load.
+var v = createVideo(test.name, test.type, "1");
+document.body.appendChild(v);
+
+// Load, add, then remove.
+v = createVideo(test.name, test.type, "1");
+v.load();
+document.body.appendChild(v);
+v.remove();
+
+// Load and add.
+v = createVideo(test.name, test.type, "2");
+v.load();
+document.body.appendChild(v);
+
+// Load outside of doc.
+v = createVideo(test.name, test.type, "3");
+v.load();
+
+// Open a new window for the following test. We open it here instead of in
+// the event handler to ensure that our document load event doesn't fire while
+// window.open is spinning the event loop.
+var w = window.open("", "testWindow", "width=400,height=400");
+testWindows.push(w);
+
+v = createVideo(test.name, test.type, "4");
+v.onloadstart = function(e) {
+  // Using a new window to do this is a bit annoying, but if we use an iframe here,
+  // delaying of the iframe's load event might interfere with the firing of our load event
+  // in some confusing way. So it's simpler just to use another window.
+  w.document.body.appendChild(v);
+};
+v.load(); // load started while in this document, this doc's load will block until
+          // the video's finished loading (in the other document).
+
+if (gRegisteredElements.length) {
+  SimpleTest.waitForExplicitFinish();
+} else {
+  todo(false, "No types supported");
+}
+
+</script>
+</pre>
+</body>
+</html>