Amongst many things, and in no particular order: A Web-standard-compliant box model. Why the default size of the box is determined by it's contents, and why the padding should be added to the overall dimensions. The Internet Explorer's model makes more sense (blasphemy). It does. Another CSS thing which puzzles me: why I can float things right and left, but not to the center? Right and left here are in fact top-right and top-left, but I sooo could use bottom-right and bottom-left positions as well... And why decided that vertical margins should collapse? Not a very important one, but still... really, why?
random rants of no importance