These algorithms only exist for checkbox and radio <{input}> elements and are not to be used for anything else. [[!HTML]] +
An {{EventTarget}} object target is said to have a listener for +type if target's event listener list contains an +event listener whose type is type. + +
The presence, or absence, of event listeners should generally remain unobservable, and the above should not be relied on to design new APIs(see [[#observing-event-listeners]]). +
target = new EventTarget();
Creates a new {{EventTarget}} object, which can be used by developers to dispatch and