aroben annevk: Up: 1, Down: -1 annevk thanks a lot annevk fwiw, you might want to file a bug on that annevk all other browsers do up: -1, down: 1 annevk (that is, Firefox, Internet Explorer and Opera)
Furthermore, TOT reports 0/0 (r17925).
Created attachment 11672 [details] demo (from URL)
Just so it's clear. Please don't consider supporting DOMMouseScroll.
This looks like a bug in the test - the actual wheelDelta value we report is +-120, with the same sign as in IE. The 0/0 part was fixed in bug 16078.