The 4D Web Companion: Links Mentioned:

HTML, CSS, and XML

For more suggestions, visit these pages on the main site:: Usability Links; Web Design Links; HTML Book Reviews; Web Design Book Reviews; Usability Book Reviews

404 Error Pages: The Good, the Bad, and the Incredibly Odd.
http://www.404lab.com/area404.asp: Custom error pages can offer one of the easiest (and most overlooked) opportunities to improve a site. The Area404 site provides a variety of inspirational, aggravating, and hilarious examples of actual 404 (Page Not Found) error pages.
A List Apart
http://www.alistapart.com/: Easily one of the best Web design sites around. The content covers a wide range of subjects in depth. The authors are highly skilled graphic designers who are struggling with the real problems of building quality Web sites.
Browser-Safe Colors: http://www.lynda.com/hexh.html; A quick and easy location for checking the browser-safe colors. Try viewing the pages on different monitors, browsers, and machines to get a full and depressing awareness of the hopelessness of trying to control color on the Web.; http://entries.the5k.org/171/visualizer.html; This page lets you test different text and background color combinations interactively. Highly addictive. [This link is not included in the book.]
CSS Master Compatibility Chart
http://www.webreview.com/style/css1/charts/mastergrid.shtml: In theory, practice and theory are the same. In practice, they're different. This joke could have been invented with Cascading Style Sheets (CSS) in mind. The CSS books talk about how it should work as if it really did work that way. It doesn't. The Master Compatibility Chart is an invaluable aid when working with CSS.
Fear of Style Sheets
http://www.alistapart.com/stories/fear/: The harsh reality of CSS as it exists today. These articles are written by Jeffrey Zeldman, a champion of standards-based Web design. He is a practical idealist.
HTML Writers Guild
http://www.hwg.org/resources/: This site is a good starting point if you're looking for help learning HTML.

If you find an out-of-date link, please send an email.