Gets event information relative to the control that can be passed to its hit testing method, for
 identifying which part of the control a user interacted with.
 
        
A plain object with properties:
     offsetX     [type: Number, mayBeNull: true]  - The horizontal pixel coordinate relative to the control before scaling.
     offsetY     [type: Number, mayBeNull: true]  - The vertical pixel coordinate relative to the control before scaling.
     pageX       [type: Number, mayBeNull: true]  - The horizontal pixel coordinate relative to the page after scaling.
     pageY       [type: Number, mayBeNull: true]  - The vertical pixel coordinate relative to the page after scaling.
     target      [type: Element, mayBeNull: true] - The topmost DOM element located at the event coordinates.