If you don't do a ton of CSS but think you have a handle on it…this survey will dispell you of that notion :) Never felt more dumb in my life than answer "never heard of it" to most of the questions about different CSS features.

We used this at my last company. We backported decisions into them as documentation. People sometimes referred to them, but not often. It was hard to take what was a huge list of docs, some of which had been obviated by others, and truly grok them all. But I don't have a better idea for how to solve the problem. I would say it worked OK, but not great.