1. EventTarget.addEventListener()

    The modern standard API for adding DOM event handlers. Introduced in the DOM Level 2 Events spec. Also implies support for `removeEventListener`, the [capture phase](https://dom.spec.whatwg.org/#dom-event-capturing_phase) of DOM event dispatch, as well as the `stopPropagation()` and `preventDefault()` event methods.

  2. eventtarget api: removeeventlistener

  3. eventtarget api: removeeventlistener: form with `options` object supported (third parameter can be either options or a `boolean`, for backwards compatibility)

  4. eventtarget api: removeeventlistener: `usecapture` parameter is optional