As a disability rights advocate, I'm very glad to see our textbook for the course incorporates accessibility into the lessons. For example, he explains why using the STRONG tag is better than BOLD, because the screen reader will emphasize the text by its tone of voice.
The lesson includes XHTML validation, and the W3C also lists sites that validate code for accessibility:
http://www.w3.org/WAI/RC/tools/complete
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