You downloaded a sample from one of our CSS books in the past, so I
thought you might be interested in brand new section of our site,
The SitePoint CSS Reference. (well, I did that's how I got this email)

You can access the site from this link:
http://reference.sitepoint.com/

In this free online reference, the entire CSS language is clearly
and concisely explained, including browser compatibility, working
examples, and easy-to-read descriptions.

The reference has been written by two of the world's most renowned
CSS experts -- Tommy Olsson and Paul O'Brien -- so you know it's
accurate, up to date, and best practice.

If you're building sites with CSS, this is a reference you'll come
back to time and time again. I hope you enjoy it.

Warm regards,

Shayne Tilley
sitepoint.com

PS: Feel free to pass this message on to anyone else who might be
interested.

-- end paste --

The first quick look, and I like the compatibilty tables they have to show if
the browser version supports that CSS 'thing' you're trying ...