window-event-restored-after-throwing-onerror.html

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This WPT test may be referenced by the following Test IDs:
- /dom/events/window-event-restored-after-throwing-onerror.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>window.event is restored after a throwing window.onerror handler</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>

<script>

setup({ allow_uncaught_exception: true });

test(t => {

    let onerrorCalls = 0;

    window.onerror = () => {

        // Throw on the first invocation, leaving window.event set to the error event mid-dispatch.

        // Only throw once so reporting the exception cannot recurse without bound.

        if (++onerrorCalls === 1)

            throw new Error("onerror throws");

};

    let outerEvent;

    window.addEventListener("outer", t.step_func(event => {

        outerEvent = event;

        assert_equals(window.event, outerEvent, "window.event is the outer event before the nested dispatch");

        // Synchronously dispatch an error event whose onerror handler throws.

        window.dispatchEvent(new ErrorEvent("error", { error: new Error("boom") }));

        assert_equals(window.event, outerEvent,

            "window.event must be restored to the outer event after a throwing onerror handler");

    }));

    window.dispatchEvent(new Event("outer"));

}, "window.event is restored after a throwing window.onerror handler");

</script>