Was creating an ad that would feature several balls rolling from left to right and right to left across the viewable area. The behavior in chrome seems to be to do the rotation transform in whatever direction is shortest -- that is, when rotating from 0 deg to 181 deg it seems like prefer counter-clockwise animation. Firefox and IE seem to rotate relative to the change, so when going from 0 to 181 degrees they would both go clockwise, since the change was positive. From 0 to -181 they would go counter-clockwise.
GWD doesn't seem to respect absolute degree inputs, it seems to try to "fix them up" so you are always in the range of +/- 180, which makes it hard to work around this.