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<!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">
<iframe name="framesetWindow" src="resources/frameset-frame.html"></iframe>
<div id="log"></div>
<script>
"use strict";
setup({ allow_uncaught_exception: true });
window.onload = () => {
const frameset = framesetWindow.document.querySelector("frameset");
promise_test(t => {
frameset.onerror = t.step_func((...args) => {
assert_equals(args.length, 1);
return true;
});
const eventWatcher = new EventWatcher(t, framesetWindow, "error");
const promise = eventWatcher.wait_for("error").then(e => {
assert_equals(e.defaultPrevented, false);
});
frameset.dispatchEvent(new Event("error", { bubbles: true, cancelable: true }));
return promise;
}, "error event is normal (return true does not cancel; one arg) on Window, with a synthetic Event");
};
</script>
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