Produces an object with consistent event argument information for data control hit testing.
A plain object with properties:
offsetX [type: Number, optional: true] - The horizontal pixel coordinate relative to the container before scaling.
offsetY [type: Number, optional: true] - The vertical pixel coordinate relative to the container before scaling.
pageX [type: Number, optional: true] - The horizontal pixel coordinate relative to the page after scaling.
pageY [type: Number, optional: true] - The vertical pixel coordinate relative to the page after scaling.
target [type: Element, optional: true] - The topmost DOM element located at the event coordinates.