EventTarget-add-remove-listener.any.js

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This WPT test may be referenced by the following Test IDs:
- /dom/events/EventTarget-add-remove-listener.any.html - WPT Dashboard Interop Dashboard
- /dom/events/EventTarget-add-remove-listener.any.worker.html - WPT Dashboard Interop Dashboard

// META: title=EventTarget's addEventListener + removeEventListener

"use strict";

function listener(evt) {

  evt.preventDefault();

  return false;

test(() => {

  const et = new EventTarget();

  et.addEventListener("x", listener, false);

  let event = new Event("x", { cancelable: true });

  let ret = et.dispatchEvent(event);

  assert_false(ret);

  et.removeEventListener("x", listener);

  event = new Event("x", { cancelable: true });

  ret = et.dispatchEvent(event);

  assert_true(ret);

}, "Removing an event listener without explicit capture arg should succeed");