Retrieves the distance and direction the wheel button has rolled.
HRESULT value = object.get_wheelDelta(* p);
the distance and direction that the wheel button has rolled.
This property indicates the distance that the wheel has rotated, expressed in multiples of
120. A positive value indicates that the wheel has rotated away from the user. A negative value indicates that the wheel has rotated toward the user.
IHTMLEventObj4::wheelDelta was introduced in Microsoft Internet Explorer 6
Build date: 11/12/2012