public interface EventListener
EventListener interface is the primary method for
 handling events. Users implement the EventListener interface
 and register their listener on an EventTarget using the
 AddEventListener method. The users should also remove their
 EventListener from its EventTarget after they
 have completed using the listener.
  When a Node is copied using the cloneNode
 method the EventListeners attached to the source
 Node are not attached to the copied Node. If
 the user wishes the same EventListeners to be added to the
 newly created copy the user must add them manually.
 
See also the Document Object Model (DOM) Level 2 Events Specification.
| Modifier and Type | Method and Description | 
|---|---|
| void | handleEvent(Event evt)This method is called whenever an event occurs of the type for which
 the   EventListenerinterface was registered. | 
void handleEvent(Event evt)
 EventListener interface was registered.evt - The Event contains contextual information
   about the event. It also contains the stopPropagation
   and preventDefault methods which are used in
   determining the event's flow and default action. Submit a bug or feature
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