javascript UIEvent Description

The W3C DOM UIEvent object is an abstract object that contains the properties and methods shared by every instance of a W3C DOM focus-related event. This object inherits characteristics from the W3C DOM Event object. The properties and method of this object are blended into the directly scripted event object. See the discussion of the event object earlier for specific property and method support for this object and how these items are inherited by more specific event types.