ISSUE-78: relatedEvent for mousewheel events doesn't work well
http://www.w3.org/2005/06/tracker/webapi/issues/78 Raised by: Ian Hickson On product: DOM 3 Events We discussed having a relatedEvent on WheelEvent to link x and y events. But I tried writing a demo using them and it doesn't work well at all. You end up having to listen to both events with the same listener, but then you don't know what the related event is going to be, it doesn't handle 3D, only 2D, etc.
