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diff --git a/testing/web-platform/tests/dom/events/Event-constructors.html b/testing/web-platform/tests/dom/events/Event-constructors.html
new file mode 100644
index 000000000..a3cd3f80c
--- /dev/null
+++ b/testing/web-platform/tests/dom/events/Event-constructors.html
@@ -0,0 +1,115 @@
+<!doctype html>
+<title>Event constructors</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+test(function() {
+  assert_throws(new TypeError(), function() {
+    new Event()
+  })
+})
+test(function() {
+  var test_error = { name: "test" }
+  assert_throws(test_error, function() {
+    new Event({ toString: function() { throw test_error; } })
+  })
+})
+test(function() {
+  var ev = new Event("")
+  assert_equals(ev.type, "")
+  assert_equals(ev.target, null)
+  assert_equals(ev.currentTarget, null)
+  assert_equals(ev.eventPhase, Event.NONE)
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, false)
+  assert_equals(ev.defaultPrevented, false)
+  assert_equals(ev.isTrusted, false)
+  assert_true(ev.timeStamp > 0)
+  assert_true("initEvent" in ev)
+})
+test(function() {
+  var ev = new Event("test")
+  assert_equals(ev.type, "test")
+  assert_equals(ev.target, null)
+  assert_equals(ev.currentTarget, null)
+  assert_equals(ev.eventPhase, Event.NONE)
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, false)
+  assert_equals(ev.defaultPrevented, false)
+  assert_equals(ev.isTrusted, false)
+  assert_true(ev.timeStamp > 0)
+  assert_true("initEvent" in ev)
+})
+test(function() {
+  assert_throws(new TypeError(), function() { Event("test") },
+                'Calling Event constructor without "new" must throw');
+})
+test(function() {
+  var ev = new Event("I am an event", { bubbles: true, cancelable: false})
+  assert_equals(ev.type, "I am an event")
+  assert_equals(ev.bubbles, true)
+  assert_equals(ev.cancelable, false)
+})
+test(function() {
+  var ev = new Event("@", { bubblesIGNORED: true, cancelable: true})
+  assert_equals(ev.type, "@")
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, true)
+})
+test(function() {
+  var ev = new Event("@", { "bubbles\0IGNORED": true, cancelable: true})
+  assert_equals(ev.type, "@")
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, true)
+})
+test(function() {
+  var ev = new Event("Xx", { cancelable: true})
+  assert_equals(ev.type, "Xx")
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, true)
+})
+test(function() {
+  var ev = new Event("Xx", {})
+  assert_equals(ev.type, "Xx")
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, false)
+})
+test(function() {
+  var ev = new Event("Xx", {bubbles: true, cancelable: false, sweet: "x"})
+  assert_equals(ev.type, "Xx")
+  assert_equals(ev.bubbles, true)
+  assert_equals(ev.cancelable, false)
+  assert_equals(ev.sweet, undefined)
+})
+test(function() {
+  var called = []
+  var ev = new Event("Xx", {
+    get cancelable() {
+      called.push("cancelable")
+      return false
+    },
+    get bubbles() {
+      called.push("bubbles")
+      return true;
+    },
+    get sweet() {
+      called.push("sweet")
+      return "x"
+    }
+  })
+  assert_array_equals(called, ["bubbles", "cancelable"])
+  assert_equals(ev.type, "Xx")
+  assert_equals(ev.bubbles, true)
+  assert_equals(ev.cancelable, false)
+  assert_equals(ev.sweet, undefined)
+})
+test(function() {
+  var ev = new CustomEvent("$", {detail: 54, sweet: "x", sweet2: "x", cancelable:true})
+  assert_equals(ev.type, "$")
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, true)
+  assert_equals(ev.sweet, undefined)
+  assert_equals(ev.detail, 54)
+})
+</script>