237   const target = new EventTarget();  constant
246     throws(() => target.dispatchEvent(i), {
266   ].forEach((i) => throws(() => target.addEventListener('foo', i), err(i)));
270   const target = new EventTarget();  constant
271   once(target, 'foo').then(common.mustCall());
272   target.dispatchEvent(new Event('foo'));
276   const target = new EventTarget();  constant
279   target.addEventListener('foo', common.mustNotCall());
280   target.dispatchEvent(event);
284   const target = new EventTarget();  constant
286   target.addEventListener('foo', common.mustCall((event) => {
289   target.addEventListener('foo', common.mustNotCall());
290   target.dispatchEvent(event);
294   const target = new EventTarget();  constant
296   target.addEventListener('foo', common.mustCall((event) => {
299   target.addEventListener('foo', common.mustNotCall());
300   target.dispatchEvent(event);
304   const target = new EventTarget();  constant
306   strictEqual(event.target, null);
307   target.addEventListener('foo', common.mustCall((event) => {
308     strictEqual(event.target, target);
309     strictEqual(event.currentTarget, target);
310     strictEqual(event.srcElement, target);
312   target.dispatchEvent(event);
328   const target = new EventTarget();  constant
329   const a = common.mustCall(() => target.removeEventListener('foo', a));
332   target.addEventListener('foo', a);
333   target.addEventListener('foo', b);
335   target.dispatchEvent(new Event('foo'));
336   target.dispatchEvent(new Event('foo'));
340   const target = new EventTarget();  constant
343   target.addEventListener('foo', a, { capture: true });
344   target.addEventListener('foo', a, { capture: false });
346   target.dispatchEvent(new Event('foo'));
347   target.removeEventListener('foo', a, { capture: true });
348   target.dispatchEvent(new Event('foo'));
349   target.removeEventListener('foo', a, { capture: false });
350   target.dispatchEvent(new Event('foo'));
353   const target = new EventTarget();  constant
354   strictEqual(target.toString(), '[object EventTarget]');
359   const target = new EventTarget();  constant
360   defineEventHandler(target, 'foo');
361   target.onfoo = common.mustCall();
362   target.dispatchEvent(new Event('foo'));
365   const target = new EventTarget();  constant
366   defineEventHandler(target, 'foo');
368   target.onfoo = () => count++;
369   target.onfoo = common.mustCall(() => count++);
370   target.dispatchEvent(new Event('foo'));
374   const target = new EventTarget();  constant
375   defineEventHandler(target, 'foo');
377   target.addEventListener('foo', () => count++);
378   target.onfoo = common.mustCall(() => count++);
379   target.dispatchEvent(new Event('foo'));
383   const target = new EventTarget();  constant
384   defineEventHandler(target, 'foo');
386   target.onfoo = fn;
387   strictEqual(target.onfoo, fn);
388   target.onfoo = null;
389   target.dispatchEvent(new Event('foo'));
394   const target = new EventTarget();  constant
398   ok(target.dispatchEvent.call(target2, event));
411     throws(() => target.dispatchEvent.call(i, event), {
424   const target = new EventTarget();  constant
425   target.addEventListener('foo', common.mustCall((e) => {
428   target.dispatchEvent(new Event('foo'));
434   const target = new EventTarget();  constant
437   target.addEventListener('toString', fn);
438   target.dispatchEvent(ev);
441   const target = new EventTarget();  constant
444   target.addEventListener('__proto__', fn);
445   target.dispatchEvent(ev);
473     strictEqual(lastWarning.target, eventTarget);
478     strictEqual(lastWarning.target, eventTarget);
490   strictEqual(event.target, eventTarget);
504   const target = new SubTarget();  constant
505   target.addEventListener('foo', common.mustCall());
506   target.dispatchEvent(new Event('foo'));
510   const target = new EventTarget();  constant
512   target.addEventListener('foo', common.mustCall(() => {
516   target.addEventListener('foo', common.mustCall(() => {
519   target.dispatchEvent(new Event('foo'));
522   const target = new EventTarget();  constant
523   defineEventHandler(target, 'foo');
524   const descriptor = Object.getOwnPropertyDescriptor(target, 'onfoo');
529   const target = new EventTarget();  constant
530   defineEventHandler(target, 'foo');
532   target.addEventListener('foo', () => output.push(1));
533   target.onfoo = common.mustNotCall();
534   target.addEventListener('foo', () => output.push(3));
535   target.onfoo = () => output.push(2);
536   target.addEventListener('foo', () => output.push(4));
537   target.dispatchEvent(new Event('foo'));