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In working with the US Government, I have found that there are requirements (Laws) that dictate that all govnt websites be accessible to people with disabilities. The US law is Section 508, from their website:
In 1998, Congress amended the Rehabilitation Act to require Federal agencies to make their electronic and information technology accessible to people with disabilities. Inaccessible technology interferes with an individual's ability to obtain and use information quickly and easily. Section 508 was enacted to eliminate barriers in information technology, to make available new opportunities for people with disabilities, and to encourage development of technologies that will help achieve these goals. The law applies to all Federal agencies when they develop, procure, maintain, or use electronic and information technology. Under Section 508 (29 U.S.C. ‘ 794d), agencies must give disabled employees and members of the public access to information that is comparable to the access available to others. It is recommended that you review the laws and regulations listed below to further your understanding about Section 508 and how you can support implementation.
http://www.section508.gov/ - http://www.section508.gov/
Here's a little tidbit from an old man who has been developing Government and non-government websites since 1995, if you seek to make your sites WAI valid, you will be pleasantly surprised with your search engine rankings. Accessibility standards lend beautifully with "machine readable" sites and that my friend is one of the many keys to search engine friendliness.
So to answer your question... YES, I do my best to validate my sites.
http://jigsaw.w3.org/css-validator/ - http://jigsaw.w3.org/css-validator/ http://feedvalidator.org/ - http://feedvalidator.org/
http://validator.w3.org/ - http://validator.w3.org/
http://www.contentquality.com/ - http://www.contentquality.com/ (508 validator)
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