Are you a web designer? You must need to know compatibility of current CSS version, you are using, with various internet browser. While designing theme for this site I found many CSS compatibility charts. Click below attached images to view charts on other sites.
Although I rarely prefer any document while working but they are really helpful when you stuck. Also read fix for floating div .
New growing web designers never forget to search CSS cheat sheets over the net. I generally avoid rewriting articles which are easily available on the net.