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diff --git a/testing/web-platform/tests/dom/events/Event-initEvent.html b/testing/web-platform/tests/dom/events/Event-initEvent.html
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+++ b/testing/web-platform/tests/dom/events/Event-initEvent.html
@@ -0,0 +1,136 @@
+<!DOCTYPE html>
+<title>Event.initEvent</title>
+<link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+var booleans = [true, false];
+booleans.forEach(function(bubbles) {
+  booleans.forEach(function(cancelable) {
+    test(function() {
+      var e = document.createEvent("Event")
+      e.initEvent("type", bubbles, cancelable)
+
+      // Step 2.
+      // Stop (immediate) propagation flag is tested later
+      assert_equals(e.defaultPrevented, false, "defaultPrevented")
+      assert_equals(e.returnValue, true, "returnValue")
+      // Step 3.
+      assert_equals(e.isTrusted, false, "isTrusted")
+      // Step 4.
+      assert_equals(e.target, null, "target")
+      assert_equals(e.srcElement, null, "srcElement")
+      // Step 5.
+      assert_equals(e.type, "type", "type")
+      // Step 6.
+      assert_equals(e.bubbles, bubbles, "bubbles")
+      // Step 7.
+      assert_equals(e.cancelable, cancelable, "cancelable")
+    }, "Properties of initEvent(type, " + bubbles + ", " + cancelable + ")")
+  })
+})
+
+test(function() {
+  var e = document.createEvent("Event")
+  e.initEvent("type 1", true, false)
+  assert_equals(e.type, "type 1", "type (first init)")
+  assert_equals(e.bubbles, true, "bubbles (first init)")
+  assert_equals(e.cancelable, false, "cancelable (first init)")
+
+  e.initEvent("type 2", false, true)
+  assert_equals(e.type, "type 2", "type (second init)")
+  assert_equals(e.bubbles, false, "bubbles (second init)")
+  assert_equals(e.cancelable, true, "cancelable (second init)")
+}, "Calling initEvent multiple times (getting type).")
+
+test(function() {
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=998809
+  var e = document.createEvent("Event")
+  e.initEvent("type 1", true, false)
+  assert_equals(e.bubbles, true, "bubbles (first init)")
+  assert_equals(e.cancelable, false, "cancelable (first init)")
+
+  e.initEvent("type 2", false, true)
+  assert_equals(e.type, "type 2", "type (second init)")
+  assert_equals(e.bubbles, false, "bubbles (second init)")
+  assert_equals(e.cancelable, true, "cancelable (second init)")
+}, "Calling initEvent multiple times (not getting type).")
+
+// Step 2.
+async_test(function() {
+  // https://www.w3.org/Bugs/Public/show_bug.cgi?id=17715
+
+  var e = document.createEvent("Event")
+  e.initEvent("type", false, false)
+  assert_equals(e.type, "type", "type (first init)")
+  assert_equals(e.bubbles, false, "bubbles (first init)")
+  assert_equals(e.cancelable, false, "cancelable (first init)")
+
+  var target = document.createElement("div")
+  target.addEventListener("type", this.step_func(function() {
+    e.initEvent("fail", true, true)
+    assert_equals(e.type, "type", "type (second init)")
+    assert_equals(e.bubbles, false, "bubbles (second init)")
+    assert_equals(e.cancelable, false, "cancelable (second init)")
+  }), false)
+
+  assert_equals(target.dispatchEvent(e), true, "dispatchEvent must return true")
+
+  this.done()
+}, "Calling initEvent must not have an effect during dispatching.")
+
+test(function() {
+  var e = document.createEvent("Event")
+  e.stopPropagation()
+  e.initEvent("type", false, false)
+  var target = document.createElement("div")
+  var called = false
+  target.addEventListener("type", function() { called = true }, false)
+  assert_false(e.cancelBubble, "cancelBubble must be false")
+  assert_true(target.dispatchEvent(e), "dispatchEvent must return true")
+  assert_true(called, "Listener must be called")
+}, "Calling initEvent must unset the stop propagation flag.")
+
+test(function() {
+  var e = document.createEvent("Event")
+  e.stopImmediatePropagation()
+  e.initEvent("type", false, false)
+  var target = document.createElement("div")
+  var called = false
+  target.addEventListener("type", function() { called = true }, false)
+  assert_true(target.dispatchEvent(e), "dispatchEvent must return true")
+  assert_true(called, "Listener must be called")
+}, "Calling initEvent must unset the stop immediate propagation flag.")
+
+async_test(function() {
+  var e = document.createEvent("Event")
+  e.initEvent("type", false, false)
+
+  var target = document.createElement("div")
+  target.addEventListener("type", this.step_func(function() {
+    e.initEvent("type2", true, true);
+    assert_equals(e.type, "type", "initEvent type setter should short-circuit");
+    assert_false(e.bubbles, "initEvent bubbles setter should short-circuit");
+    assert_false(e.cancelable, "initEvent cancelable setter should short-circuit");
+  }), false)
+  assert_equals(target.dispatchEvent(e), true, "dispatchEvent must return true")
+
+  this.done()
+}, "Calling initEvent during propagation.")
+
+test(function() {
+  var e = document.createEvent("Event")
+  assert_throws_js(TypeError, function() {
+    e.initEvent()
+  })
+}, "First parameter to initEvent should be mandatory.")
+
+test(function() {
+  var e = document.createEvent("Event")
+  e.initEvent("type")
+  assert_equals(e.type, "type", "type")
+  assert_false(e.bubbles, "bubbles")
+  assert_false(e.cancelable, "cancelable")
+}, "Tests initEvent's default parameter values.")
+</script>