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diff --git a/testing/web-platform/tests/dom/events/Event-init-while-dispatching.html b/testing/web-platform/tests/dom/events/Event-init-while-dispatching.html
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index 0000000000..2aa1f6701c
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+++ b/testing/web-platform/tests/dom/events/Event-init-while-dispatching.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Re-initializing events while dispatching them</title>
+<link rel="author" title="Josh Matthews" href="mailto:josh@joshmatthews.net">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+var events = {
+  'KeyboardEvent': {
+    'constructor': function() { return new KeyboardEvent("type", {key: "A"}); },
+    'init': function(ev) { ev.initKeyboardEvent("type2", true, true, null, "a", 1, "", true, "") },
+    'check': function(ev) {
+       assert_equals(ev.key, "A", "initKeyboardEvent key setter should short-circuit");
+       assert_false(ev.repeat, "initKeyboardEvent repeat setter should short-circuit");
+       assert_equals(ev.location, 0, "initKeyboardEvent location setter should short-circuit");
+     }
+  },
+  'MouseEvent': {
+    'constructor': function() { return new MouseEvent("type"); },
+    'init': function(ev) { ev.initMouseEvent("type2", true, true, null, 0, 1, 1, 1, 1, true, true, true, true, 1, null) },
+    'check': function(ev) {
+      assert_equals(ev.screenX, 0, "initMouseEvent screenX setter should short-circuit");
+      assert_equals(ev.screenY, 0, "initMouseEvent screenY setter should short-circuit");
+      assert_equals(ev.clientX, 0, "initMouseEvent clientX setter should short-circuit");
+      assert_equals(ev.clientY, 0, "initMouseEvent clientY setter should short-circuit");
+      assert_false(ev.ctrlKey, "initMouseEvent ctrlKey setter should short-circuit");
+      assert_false(ev.altKey, "initMouseEvent altKey setter should short-circuit");
+      assert_false(ev.shiftKey, "initMouseEvent shiftKey setter should short-circuit");
+      assert_false(ev.metaKey, "initMouseEvent metaKey setter should short-circuit");
+      assert_equals(ev.button, 0, "initMouseEvent button setter should short-circuit");
+    }
+  },
+  'CustomEvent': {
+    'constructor': function() { return new CustomEvent("type") },
+    'init': function(ev) { ev.initCustomEvent("type2", true, true, 1) },
+    'check': function(ev) {
+      assert_equals(ev.detail, null, "initCustomEvent detail setter should short-circuit");
+    }
+  },
+  'UIEvent': {
+    'constructor': function() { return new UIEvent("type") },
+    'init': function(ev) { ev.initUIEvent("type2", true, true, window, 1) },
+    'check': function(ev) {
+      assert_equals(ev.view, null, "initUIEvent view setter should short-circuit");
+      assert_equals(ev.detail, 0, "initUIEvent detail setter should short-circuit");
+    }
+  },
+  'Event': {
+    'constructor': function() { return new Event("type") },
+    'init': function(ev) { ev.initEvent("type2", true, true) },
+    'check': function(ev) {
+      assert_equals(ev.bubbles, false, "initEvent bubbles setter should short-circuit");
+      assert_equals(ev.cancelable, false, "initEvent cancelable setter should short-circuit");
+      assert_equals(ev.type, "type", "initEvent type setter should short-circuit");
+    }
+  }
+};
+
+var names = Object.keys(events);
+for (var i = 0; i < names.length; i++) {
+  var t = async_test("Calling init" + names[i] + " while dispatching.");
+  t.step(function() {
+    var e = events[names[i]].constructor();
+
+    var target = document.createElement("div")
+    target.addEventListener("type", t.step_func(function() {
+      events[names[i]].init(e);
+
+      var o = e;
+      while ((o = Object.getPrototypeOf(o))) {
+        if (!(o.constructor.name in events)) {
+          break;
+        }
+        events[o.constructor.name].check(e);
+      }
+    }), false);
+
+    assert_equals(target.dispatchEvent(e), true, "dispatchEvent must return true")
+  });
+  t.done();
+}
+</script>