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diff --git a/testing/web-platform/tests/uievents/legacy-domevents-tests/submissions/Microsoft/mouseenter.relatedTarget.html b/testing/web-platform/tests/uievents/legacy-domevents-tests/submissions/Microsoft/mouseenter.relatedTarget.html
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+++ b/testing/web-platform/tests/uievents/legacy-domevents-tests/submissions/Microsoft/mouseenter.relatedTarget.html
@@ -0,0 +1,69 @@
+<!DOCTYPE HTML>
+<html>
+    <head>
+        <title id='desc'> MouseEvent.relatedTarget for mouseenter Event </title>
+        <script type="text/javascript">
+            var PassTest = function()
+            {
+                document.getElementById("testresult").firstChild.data = "PASS";
+            }
+
+            var FailTest = function()
+            {
+                document.getElementById("testresult").firstChild.data = "FAIL";
+            }
+
+            var EVENT = "mouseenter";
+            var TARGET, PARENT;
+
+            window.onload = function(e)
+            {
+                try
+                {
+                    TARGET = document.getElementById("target");
+                    PARENT = document.getElementById("parent");
+                    TARGET.addEventListener(EVENT, TestEvent, true);
+                }
+                catch(ex)
+                {
+                    FailTest();
+                }
+            }
+
+            function TestEvent(evt)
+            {
+                if (evt.type == EVENT && evt.relatedTarget == PARENT)
+                {
+                    PassTest();
+                }
+                else
+                {
+                    FailTest();
+                }
+            }
+        </script>
+    </head>
+    <body>
+        <h3>DOM Events</h3>
+        <h4>
+            Test Description: MouseEvent.relatedTarget for mouseenter event indicates
+            the event target a pointing device is exiting, if any.
+        </h4>
+
+        <pre>
+            <div id="parent" style="border:solid 1px green; width:350px; height:100px;">
+
+                <button id="target">BUTTON</button>
+
+            </div>
+
+            Steps:
+            1) Move the mouse pointer into the above green rectangle
+            2) Then move the mouse pointer onto the button
+        </pre>
+
+        <p>Test passes if the word "PASS" appears below after following the above steps.</p>
+           <div>Test result: </div>
+        <div id='testresult'>FAIL</div>
+    </body>
+</html>
+\ No newline at end of file