From W3C Wiki
The EventTarget interface must be implemented by all the objects which could be event targets in an implementation which supports an event flow. The interface allows registration and removal of event listeners, and dispatch of events to an event target.
|Registers an event listener.|
|Removes an event listener.|
|Dispatches an event into the implementation's event model.|
DOM Core reference
DOM Core specification defines the Interface EventTarget in 4.3 Interface EventTarget.