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+++ b/testing/web-platform/tests/dom/events/EventTarget-dispatchEvent-returnvalue.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>EventTarget.dispatchEvent: return value</title>
+<link rel="help" href="https://dom.spec.whatwg.org/#concept-event-dispatch">
+<link rel="help" href="https://dom.spec.whatwg.org/#dom-event-preventdefault">
+<link rel="help" href="https://dom.spec.whatwg.org/#dom-event-returnvalue">
+<link rel="help" href="https://dom.spec.whatwg.org/#dom-event-defaultprevented">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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>
+test(function() {
+    var event_type = "foo";
+    var target = document.getElementById("target");
+    var parent = document.getElementById("parent");
+    var default_prevented;
+    var return_value;
+
+    parent.addEventListener(event_type, function(e) {}, true);
+    target.addEventListener(event_type, function(e) {
+        evt.preventDefault();
+        default_prevented = evt.defaultPrevented;
+        return_value = evt.returnValue;
+    }, true);
+    target.addEventListener(event_type, function(e) {}, true);
+
+    var evt = document.createEvent("Event");
+    evt.initEvent(event_type, true, true);
+
+    assert_true(parent.dispatchEvent(evt));
+    assert_false(target.dispatchEvent(evt));
+    assert_true(default_prevented);
+    assert_false(return_value);
+}, "Return value of EventTarget.dispatchEvent() affected by preventDefault().");
+
+test(function() {
+    var event_type = "foo";
+    var target = document.getElementById("target");
+    var parent = document.getElementById("parent");
+    var default_prevented;
+    var return_value;
+
+    parent.addEventListener(event_type, function(e) {}, true);
+    target.addEventListener(event_type, function(e) {
+        evt.returnValue = false;
+        default_prevented = evt.defaultPrevented;
+        return_value = evt.returnValue;
+    }, true);
+    target.addEventListener(event_type, function(e) {}, true);
+
+    var evt = document.createEvent("Event");
+    evt.initEvent(event_type, true, true);
+
+    assert_true(parent.dispatchEvent(evt));
+    assert_false(target.dispatchEvent(evt));
+    assert_true(default_prevented);
+    assert_false(return_value);
+}, "Return value of EventTarget.dispatchEvent() affected by returnValue.");
+</script>