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diff --git a/testing/web-platform/tests/dom/events/Event-defaultPrevented.html b/testing/web-platform/tests/dom/events/Event-defaultPrevented.html
new file mode 100644
index 0000000000..2548fa3e06
--- /dev/null
+++ b/testing/web-platform/tests/dom/events/Event-defaultPrevented.html
@@ -0,0 +1,55 @@
+<!doctype html>
+<title>Event.defaultPrevented</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+var ev;
+test(function() {
+  ev = document.createEvent("Event");
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented");
+}, "When an event is created, defaultPrevented should be initialized to false.");
+test(function() {
+  ev.initEvent("foo", true, false);
+  assert_equals(ev.bubbles, true, "bubbles");
+  assert_equals(ev.cancelable, false, "cancelable");
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented");
+}, "initEvent should work correctly (not cancelable).");
+test(function() {
+  assert_equals(ev.cancelable, false, "cancelable (before)");
+  ev.preventDefault();
+  assert_equals(ev.cancelable, false, "cancelable (after)");
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented");
+}, "preventDefault() should not change defaultPrevented if cancelable is false.");
+test(function() {
+  assert_equals(ev.cancelable, false, "cancelable (before)");
+  ev.returnValue = false;
+  assert_equals(ev.cancelable, false, "cancelable (after)");
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented");
+}, "returnValue should not change defaultPrevented if cancelable is false.");
+test(function() {
+  ev.initEvent("foo", true, true);
+  assert_equals(ev.bubbles, true, "bubbles");
+  assert_equals(ev.cancelable, true, "cancelable");
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented");
+}, "initEvent should work correctly (cancelable).");
+test(function() {
+  assert_equals(ev.cancelable, true, "cancelable (before)");
+  ev.preventDefault();
+  assert_equals(ev.cancelable, true, "cancelable (after)");
+  assert_equals(ev.defaultPrevented, true, "defaultPrevented");
+}, "preventDefault() should change defaultPrevented if cancelable is true.");
+test(function() {
+  ev.initEvent("foo", true, true);
+  assert_equals(ev.cancelable, true, "cancelable (before)");
+  ev.returnValue = false;
+  assert_equals(ev.cancelable, true, "cancelable (after)");
+  assert_equals(ev.defaultPrevented, true, "defaultPrevented");
+}, "returnValue should change defaultPrevented if cancelable is true.");
+test(function() {
+  ev.initEvent("foo", true, true);
+  assert_equals(ev.bubbles, true, "bubbles");
+  assert_equals(ev.cancelable, true, "cancelable");
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented");
+}, "initEvent should unset defaultPrevented.");
+</script>