The addEventListener() method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target.
Optionaloptions: boolean | AddEventListenerOptionsThe dispatchEvent() method of the EventTarget sends an Event to the object, (synchronously) invoking the affected event listeners in the appropriate order.
Focus the first invalid element.
The removeEventListener() method of the EventTarget interface removes an event listener previously registered with EventTarget.addEventListener() from the target.
Optionaloptions: boolean | EventListenerOptionsReset the validator to its initial state.
Validate the form, will return a promise that resolves to true if what the Validator represents is valid.
Returns true if the validator is valid. This might represent last known state and might first be updated when validate() is called.