The first half of the tutorial is about the parts of CSS that are considered most stable. That includes level 2 and a few modules of level 3. All modules here are W3C Recommendations or W3C Candidate Recommendations that the CSS working group believes can be implemented with very little fear of future changes.

This tutorial assumes that you already know level 2 of CSS and only talks about level 3.

The second part of the tutorial is a small selection of other modules of CSS level 3. Some of them are Candidate Recommendations, which means W3C recommends people to implement them (and send feedback), but at the time the implementations are still rare and incomplete. You are recommended to try these modules, but be aware that they may not work in all your software yet.

The others are only Working Drafts and there are at most experimental implementations. We hope you will soon be able to use these modules, but at the moment you should not, unless it is to experiment.

There are many more modules in the works, several have experimental implementations to play with, but it would take several days to talk about them all…