WheelEvent

void initWheelEvent(
    in long wheelDeltaX, 
    in long wheelDeltaY, 
    in DOMWindow view, 
    in long screenX, 
    in long screenY, 
    in long clientX, 
    in long clientY, 
    in boolean ctrlKey, 
    in boolean altKey, 
    in boolean shiftKey, 
    in boolean metaKey); 

readonly attribute boolean altKey; 

readonly attribute long clientX; 

readonly attribute long clientY; 

readonly attribute boolean ctrlKey; 

readonly attribute boolean metaKey; 

readonly attribute long offsetX; 

readonly attribute long offsetY; 

readonly attribute long screenX; 

readonly attribute long screenY; 

readonly attribute boolean shiftKey; 

readonly attribute long wheelDelta; 

readonly attribute long wheelDeltaX; 

readonly attribute long wheelDeltaY; 

readonly attribute long x; 

readonly attribute long y;