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+++ b/testing/web-platform/tests/uievents/legacy-domevents-tests/approved/stopImmediatePropagation.effect.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title> Event.stopImmediatePropagation() immediate effect </title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div id=log></div>
+
+<table id="table" border="1" style="display: none">
+    <tbody id="table-body">
+    <tr id="table-row">
+        <td id="table-cell">Shady Grove</td>
+        <td>Aeolian</td>
+    </tr>
+    <tr id="parent">
+        <td id="target">Over the river, Charlie</td>
+        <td>Dorian</td>
+    </tr>
+    </tbody>
+</table>
+
+<script>
+    var EVENT = "foo";
+    var TARGET = document.getElementById("target");
+    var PARENT = document.getElementById("parent");
+    var TBODY = document.getElementById("table-body");
+    var TABLE = document.getElementById("table");
+    var BODY = document.body;
+    var HTML = document.documentElement;
+    var CurrentTargets = [window, document, HTML, BODY, TABLE, TBODY, PARENT, TARGET];
+    var ExpectResult = [window, window, document, document, HTML, HTML, BODY, BODY, TABLE];
+    var ActualResult = [];
+    var ExpectListeners = [0,1,0,1,0,1,0,1,0];
+    var ActualListeners = [];
+
+    var description = "Test Description: " +
+                      "stopImmediatePropagation() prevents other event listeners from being triggered and, unlike " +
+                      "Event.stopPropagation(), its effect must be immediate. Once it has been called, further calls " +
+                      "to this method have no additional effect.";
+
+    test(function()
+    {
+        for (var i=0; i < CurrentTargets.length; i++)
+        {
+            CurrentTargets[i].addEventListener(EVENT, function(e){TestEvent(e, 0)}, true);
+            CurrentTargets[i].addEventListener(EVENT, function(e){TestEvent(e, 1)}, true);
+        }
+
+        var evt = document.createEvent("Event");
+        evt.initEvent(EVENT, true, true);
+        TARGET.dispatchEvent(evt);
+
+        assert_array_equals(ActualResult, ExpectResult, "ActualResult");
+        assert_array_equals(ActualListeners, ExpectListeners, "ActualListeners");
+
+    }, description);
+
+    function TestEvent(evt, i)
+    {
+        ActualResult.push(evt.currentTarget);
+        ActualListeners.push(i);
+        if ((1 == evt.eventPhase) && (TABLE == evt.currentTarget) && (0 == i))
+        {
+            evt.stopImmediatePropagation();
+        }
+    }
+</script>
+</body>
+</html>