--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/proposals/mousewheel.txt	Tue Aug 22 16:50:29 2006 +0900
@@ -0,0 +1,60 @@
+When "mouse wheeling" occurs, the implementation must dispatch a <code>mousemultiwheel</code> event implementing the following interface:
+
+interface MouseMultiWheelEvent : MouseEvent {
+   readonly attribute long            wheelDeltaX;
+   readonly attribute long            wheelDeltaY;
+   readonly attribute long            wheelDeltaZ;
+   void               initMouseMultiWheelEventNS(in DOMString namespaceURI,
+                                                 in DOMString typeArg,
+                                                 in boolean canBubbleArg,
+                                                 in boolean cancelableArg,
+                                                 in views::AbstractView  
+viewArg,
+                                                 in long detailArg,
+                                                 in long screenXArg,
+                                                 in long screenYArg,
+                                                 in long clientXArg,
+                                                 in long clientYArg,
+                                                 in unsigned short buttonArg,
+                                                 in EventTarget relatedTargetArg,
+                                                 in DOMString modifiersList,
+                                                 in long wheelDeltaX,
+                                                 in long wheelDeltaY,
+                                                 in long wheelDeltaZ);
+};
+
+wheelDeltaX is a number indicating the horizontal distance (positive means rotated to the right, negative means rotated to the left).
+
+wheelDeltaY is a number indicating the vertical distance (positive means rotated away from user or to the right, negative means rotated towards user or to the left).
+
+wheelDeltaZ, included for future extensibility, is a number indicating the distance along a third unspecified axis (positive means rotated away from the user, means rotated towards user). At the present time, implementors may use whatever modality is best suited to the task, such as the the use of the wheel in conjunction with a control key.
+
+The default value of wheelDeltaX, wheelDeltaY and wheelDeltaZ is 0. UIEvent.detail must always be 0.
+
+This event includes both scroll deltas. The default action of this event is to dispatch a <code>mousewheel</code> event if the y delta is non-zero. Besides that, its default action is to do whatever platform conventions suggest for the wheeling behavior.
+
+The <code>mousewheel</code> event implements the following interface:
+
+interface MouseWheelEvent : MouseEvent {
+   readonly attribute long            wheelDelta;
+   void               initMouseWheelEventNS(in DOMString namespaceURI,
+                                            in DOMString typeArg,
+                                            in boolean canBubbleArg,
+                                            in boolean cancelableArg,
+                                            in views::AbstractView viewArg,
+                                            in long detailArg,
+                                            in long screenXArg,
+                                            in long screenYArg,
+                                            in long clientXArg,
+                                            in long clientYArg,
+                                            in unsigned short buttonArg,
+                                            in EventTarget relatedTargetArg,
+                                            in DOMString modifiersList,
+                                            in long wheelDelta);
+};
+
+If the <code>mousewheel</code> event is cancelled, only the default action for vertical wheeling is cancelled. The wheelDelta attribute is a number indicating the distance (positive means rotated away from the user, negative means rotated towards the user). The default value of the wheelDelta attribute is 0.
+
+XXX: What about UIEvent.detail?
+
+For both <code>mousemultiwheel</code> and <code>mousewheel</code> <code>MouseEvent.relatedNode</code> must point to the element being wheel'd over or <code>null</code> if there is no such element. (For example, when using some device without a pointer but with some way to wheel you'd get that.)
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