Compatibility and Accessibility in SharePoint Designer
Although the out-of-the-box SharePoint 2010 sites might meet some or all of the Web standards you are concerned with, as you customize SharePoint 2010 sites you’ll benefit from testing and validating your sites for standards compliance before deploying them.
SharePoint Designer 2010 includes built-in tools for both page compliance and accessibility. It also addresses Web standards as set by the W3C, which work hand-in-hand with the DOCTYPE and schemas assigned to pages in SharePoint sites. You can find further details on W3C standards at the following sites:
• Accessibility: http://www.w3.org/WAI/ and http://www.access-board.gov/sec508/standards.htm#Subpart_b ...