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<!DOCTYPE html>
<meta charset="utf-8">
<title>window.onerror handler restores window.event after it reports an exception</title>
<link rel="help" href="https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<iframe src="resources/empty-document.html"></iframe>
<iframe src="resources/empty-document.html"></iframe>
<script>
setup({ allow_uncaught_exception: true });
async_test(t => {
window.onload = t.step_func_done(onLoadEvent => {
frames[0].onerror = new frames[1].Function(`
top.eventDuringSecondOnError = top.window.event;
top.frames[0].eventDuringSecondOnError = top.frames[0].event;
top.frames[1].eventDuringSecondOnError = top.frames[1].event;
`);
window.onerror = new frames[0].Function(`
top.eventDuringFirstOnError = top.window.event;
top.frames[0].eventDuringFirstOnError = top.frames[0].event;
top.frames[1].eventDuringFirstOnError = top.frames[1].event;
foo; // cause second onerror
`);
const myEvent = new ErrorEvent("error", { error: new Error("myError") });
window.dispatchEvent(myEvent);
assert_equals(top.eventDuringFirstOnError, onLoadEvent);
assert_equals(frames[0].eventDuringFirstOnError, myEvent);
assert_equals(frames[1].eventDuringFirstOnError, undefined);
assert_equals(top.eventDuringSecondOnError, onLoadEvent);
assert_equals(frames[0].eventDuringSecondOnError, myEvent);
assert_equals(frames[1].eventDuringSecondOnError.error.name, "ReferenceError");
});
});
</script>
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