class method Event.pointerX
Event.pointerX(event) → NumberReturns the absolute horizontal position of the pointer for a mouse event.
Note that this position is absolute on the <body>, not on the
viewport: scrolling right increases the returned value for events on
the same viewport location.
This method can be called either as an instance method or as a generic method. If calling as a generic, pass the instance in as the first argument.