| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>Event handlers processing algorithm: error events</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-event-handler-processing-algorithm"> |
| <link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me"> |
| |
| <div id="log"></div> |
| |
| <script> |
| "use strict"; |
| setup({ allow_uncaught_exception: true }); |
| |
| promise_test(t => { |
| document.onerror = t.step_func((...args) => { |
| assert_equals(args.length, 1); |
| return true; |
| }); |
| |
| const eventWatcher = new EventWatcher(t, document, "error"); |
| const promise = eventWatcher.wait_for("error").then(e => { |
| assert_equals(e.defaultPrevented, false); |
| }); |
| |
| document.dispatchEvent(new ErrorEvent("error", { cancelable: true })); |
| |
| return promise; |
| }, "error event is normal (return true does not cancel; one arg) on Document, with a synthetic ErrorEvent"); |
| </script> |
