The Event interface is used to provide contextual information
about an event to the handler processing the event. An object which
implements the Event interface is generally passed as the
first parameter to an event handler. More specific context information is
passed to event handlers by deriving additional interfaces from
Event which contain information directly relating to the
type of event they accompany. These derived interfaces are also
implemented by the object passed to the event listener.
Eventinterface is used to provide contextual information about an event to the handler processing the event. An object which implements theEventinterface is generally passed as the first parameter to an event handler. More specific context information is passed to event handlers by deriving additional interfaces fromEventwhich contain information directly relating to the type of event they accompany. These derived interfaces are also implemented by the object passed to the event listener.See also the Document Object Model (DOM) Level 2 Events Specification.