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Guidelines for Accessible and Usable Web Sites:
Observing Users Who Work With Screen Readers
http://redish.net/content/papers/interactions.html
Cascading Style Sheets, level 2 revision 1
CSS 2.1 Specification
http://w3.org/TR/CSS21/cover.html#minitoc
Guild of Accessible Web Designers
http://www.gawds.org/