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pageoneresults - 7:44 pm on Feb 21, 2006 (gmt 0)
Guideline 3. Use markup and style sheets and do so properly. If a site is using markup and it is broken, does that not break the accessibility/usability chain? What HTML/XHTML errors can you find that can be ignored and not have an impact on the A/U of the site?
I'm not too certain you can achieve 100% accessibility and usability without validation.
[w3.org...]