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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/scripting/events/event-handler-processing-algorithm-error/window-synthetic-event.html 

<!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:[email protected]">

<div id="log"></div>

<script>
"use strict";
setup({ allow_uncaught_exception: true });

promise_test(t => {
  window.onerror = t.step_func((...args) => {
    assert_equals(args.length, 1);
    return true;
  });

  const eventWatcher = new EventWatcher(t, window, "error");
  const promise = eventWatcher.wait_for("error").then(e => {
    assert_equals(e.defaultPrevented, false);
  });

  window.dispatchEvent(new Event("error", { cancelable: true }));

  return promise;
}, "error event is normal (return true does not cancel; one arg) on Window, with a synthetic Event");
</script>