The dispatchEvent() method of the EventTarget sends an Event to the object, (synchronously) invoking the affected event listeners in the appropriate order.
The removeEventListener() method of the EventTarget interface removes an event listener previously registered with EventTarget.addEventListener() from the target.
Optionaloptions: boolean | EventListenerOptions
The
addEventListener()method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target.MDN Reference