third_party/web_platform_tests/dom/events/Event-defaultPrevented.html

<!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() {
  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 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 unset defaultPrevented.");
</script>