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diff --git a/dom/events/test/test_bug1079236.html b/dom/events/test/test_bug1079236.html
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+++ b/dom/events/test/test_bug1079236.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1079236
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1079236</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 1079236 **/
+
+  function runTests() {
+    var iframe = document.createElement('iframe');
+    document.body.appendChild(iframe);
+    iframe.contentDocument.body.innerHTML = '<div id="content"></div>';
+
+    var c = iframe.contentDocument.getElementById("content");
+    var sr = c.attachShadow({mode: 'open'});
+    sr.innerHTML = "<input type='file'" + ">";
+    var file = sr.firstChild;
+    is(file.type, "file");
+    file.offsetLeft; // Flush layout because dispatching mouse events.
+    iframe.contentDocument.body.onmousemove = function(e) {
+      is(e.target, c, "Event target should be the element in non-Shadow DOM");
+      if (e.originalTarget == file) {
+        is(e.originalTarget, file,
+           "type='file' implementation doesn't seem to have native anonymous content");
+      } else {
+        var wrapped = SpecialPowers.wrap(e.originalTarget);
+        isnot(wrapped, file, "Shouldn't have the same event.target and event.originalTarget");
+      }
+
+      ok(!("composedTarget" in e), "Events shouldn't have composedTarget in non-chrome context!");
+      e = SpecialPowers.wrap(e);
+      var composedTarget = SpecialPowers.unwrap(e.composedTarget);
+      is(composedTarget, file, "composedTarget should be the file object.");
+
+      SimpleTest.finish();
+    }
+
+    var r = file.getBoundingClientRect();
+    synthesizeMouse(file, r.width / 6, r.height / 2, { type: "mousemove"}, iframe.contentWindow);
+    iframe.contentDocument.body.onmousemove = null;
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  window.onload = () => {
+    SimpleTest.waitForFocus(runTests);
+  };
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1079236">Mozilla Bug 1079236</a>
+<p id="display"></p>
+<div id="content">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>