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.