This document is no longer maintained. For the latest version, see https://www.w3.org/WAI/WCAG22/Techniques/. Technical references are typically included within the Related Resources section of relevant pages.
"Cascading Style Sheets, level 1," B. Bos, H. Wium Lie, eds., W3C Recommendation 17 Dec 1996, revised 11 Jan 1999. Available at http://www.w3.org/TR/REC-CSS1/.
CSS2
"Cascading Style Sheets, level 2," B. Bos, H. Wium Lie, C. Lilley, and I. Jacobs, eds., W3C Recommendation 12 May 1998. Available at http://www.w3.org/TR/CSS2/.
CSS21
"Cascading Style Sheets, level 2 revision 1," B. Bos, T. Çelik, I. Hickson, H. Wium Lie, eds., W3C Candidate Recommendation 25 February 2004. Available at: http://www.w3.org/TR/CSS21/
"XHTML 1.0 The Extensible HyperText Markup Language (Second Edition)," S. Pemberton, et al., W3C Recommendation 26 January 2000, revised 1 August 2002. Available at: http://www.w3.org/TR/xhtml1/.