class method Event.pointerY
Event.pointerY(event) → NumberReturns the absolute vertical position of the pointer for a mouse event.
Note that this position is absolute on the <body>, not on the
viewport: scrolling down 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.