I'm curious: how do you feel about css transitions? I'm being totally non-snarky here, and I fully agree in the ideals of separating the three concerns, but I sometimes wonder if the existing lines aren't drawn in slightly the wrong place.
Conceptually, I think what they cover fits more into presentation than behavior, because its how the transition from one state to another is shown. So I don't see CSS transitions as an example of the line being drawn in the wrong place.
I'm not saying that its always clear cut or that reasonable people can't disagree on where to draw the line.
