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[dom] Add tests for "inner invoke" with EventTarget in a detached iframe #34350

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[dom] Add tests for "inner invoke" with EventTarget in a detached iframe #34350

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62 changes: 62 additions & 0 deletions dom/events/EventTarget-detached-iframe.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<meta charset="utf-8">
<title>EventTarget in Detached iframe</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>
"use strict";

async function addFrameAndWaitForLoad(srcdoc) {
const frame = document.createElement('iframe');
frame.srcdoc = srcdoc;
await new Promise((resolve) => {
frame.addEventListener('load', resolve);
document.body.appendChild(frame);
});
return frame;
}

for (let eventType of ["inner", "outer"]) {
promise_test(async t => {
const frame = await addFrameAndWaitForLoad(`<script>
window.parent.innerEventTarget = new EventTarget();
window.parent.innerEvent = new Event('event');
<\/script>`);

let fireCount = 0;
window.innerEventTarget.addEventListener('event', () => {
++fireCount;
});

const event = eventType == "inner" ? window.innerEvent : new Event('event');
window.innerEventTarget.dispatchEvent(event);
frame.remove();
window.innerEventTarget.dispatchEvent(event);

assert_equals(fireCount, 1, `Expected one listener to run for type "${eventType}"`);
}, `Event handlers for EventTargets in detached iframes do not fire with ${eventType} iframe events`);
}

promise_test(async t => {
const frame = await addFrameAndWaitForLoad(`<script>
window.parent.innerEventTarget = new EventTarget();
<\/script>`);

let fireCount = 0;
window.innerEventTarget.addEventListener('event', () => {
++fireCount;
frame.remove();
});
window.innerEventTarget.addEventListener('event', () => {
++fireCount;
});

window.innerEventTarget.dispatchEvent(new Event('event'));

assert_equals(fireCount, 1);
}, "Event listeners do not run after detaching an EventTarget's iframe during event dispatch");

</script>