wpt/dom/events/EventTarget-detached-iframe.html at d8f3c9c71d22d8aab3c517686ec3b4208b1d962a · web-platform-tests/wpt · GitHub

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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>