One tends to repeat oneself a lot in a stylesheet. This is sort of tied to the overspecification issue I mentioned earlier. The situation that made me realize this was one in which I was using float and clear on two separate elements (due to the fun property of floats existing outside of the flow, I had to use a spacer element with the clear property to ensure that both floating and static content fit within the container – the first time I’ve used a spacer element since I began using CSS some 9 or so years ago).

Change the float to left, change the clear to left. Change the float to right, change the clear to right. Any other combination didn’t work (as I had another float on the left, I couldn’t use clear: both – by the way, while we’re suggesting improvements to CSS, it’d be nice to be able to clear individual floats while preserving others in the same direction). For content outside of the flow, change the height in one place, change the margin in another. There’s duplication of content all over the place.