text: const otherWindow = document.body.appendChild(document.createElement("iframe")).contentWindow;
  
  ["EventTarget", "XMLHttpRequest"].forEach(constructorName => {
    async_test(t => {
      const eventTarget = new otherWindow[constructorName]();
      eventTarget.addEventListener("hi", t.step_func_done(e => {
        assert_equals(otherWindow.event, undefined);
        assert_equals(e, window.event);
      }));
      eventTarget.dispatchEvent(new Event("hi"));
    }, "window.event for constructors from another global: " + constructorName);
  });
  
  // XXX: It would be good to test a subclass of EventTarget once we sort out
  // https://github.com/heycam/webidl/issues/540
  
  async_test(t => {
    const element = document.body.appendChild(otherWindow.document.createElement("meh"));
    element.addEventListener("yo", t.step_func_done(e => {
      assert_equals(e, window.event);
    }));
    element.dispatchEvent(new Event("yo"));
  }, "window.event and element from another document");
  
  async_test(t => {
    const doc = otherWindow.document,
          element = doc.body.appendChild(doc.createElement("meh")),
          child = element.appendChild(doc.createElement("bleh"));
    element.addEventListener("yoyo", t.step_func(e => {
      document.body.appendChild(element);
      assert_equals(element.ownerDocument, document);
      assert_equals(window.event, e);
      assert_equals(otherWindow.event, undefined);
    }), true);
    element.addEventListener("yoyo", t.step_func(e => {
      assert_equals(element.ownerDocument, document);
      assert_equals(window.event, e);
      assert_equals(otherWindow.event, undefined);
    }), true);
    child.addEventListener("yoyo", t.step_func_done(e => {
      assert_equals(child.ownerDocument, document);
      assert_equals(window.event, e);
      assert_equals(otherWindow.event, undefined);
    }));
    child.dispatchEvent(new Event("yoyo"));
  }, "window.event and moving an element post-dispatch");
  
  test(t => {
    const host = document.createElement("div"),
          shadow = host.attachShadow({ mode: "open" }),
          child = shadow.appendChild(document.createElement("trala")),
          furtherChild = child.appendChild(document.createElement("waddup"));
    let counter = 0;
    host.addEventListener("hi", t.step_func(e => {
      assert_equals(window.event, e);
      assert_equals(counter++, 3);
    }));
    child.addEventListener("hi", t.step_func(e => {
      assert_equals(window.event, undefined);
      assert_equals(counter++, 2);
    }));
    furtherChild.addEventListener("hi", t.step_func(e => {
      host.appendChild(child);
      assert_equals(window.event, undefined);
      assert_equals(counter++, 0);
    }));
    furtherChild.addEventListener("hi", t.step_func(e => {
      assert_equals(window.event, undefined);
      assert_equals(counter++, 1);
    }));
    furtherChild.dispatchEvent(new Event("hi", { composed: true, bubbles: true }));
    assert_equals(counter, 4);
  }, "window.event should not be affected by nodes moving post-dispatch");
  
  async_test(t => {
    const frame = document.body.appendChild(document.createElement("iframe"));
    frame.src = "resources/event-global-extra-frame.html";
    frame.onload = t.step_func_done((load_event) => {
      const event = new Event("hi");
      document.addEventListener("hi", frame.contentWindow.listener); // listener intentionally not wrapped in t.step_func
      document.addEventListener("hi", t.step_func(e => {
        assert_equals(event, e);
        assert_equals(window.event, e);
      }));
      document.dispatchEvent(event);
      assert_equals(frameState.event, event);
      assert_equals(frameState.windowEvent, event);
      assert_equals(frameState.parentEvent, load_event);
    });
  }, "Listener from a different global");
  