Every once in a while I sit down and try to figure out just what the CSS3 spec actually says. Sometimes even after reading it, it’s not clear. As I figure stuff out, I create little reference pages with the info in a distilled format. Check back now and then to see what I’ve added, or (better yet) suggest stuff you’d like to see.

Table of CSS3 border-radius Compliance is a fairly detailed look at all the different ways various browsers get things wrong. It also shows what they do right, which makes this a handy day-to-day reference as well.

Colors in CSS3 is a simpler table that shows how to use alpha (opacity) and the HSL color model, and gives a few examples.