Simple designs are easier to use and maintain. Design simple sites, emphasizing important elements and using simple structures and clean, standards-based markup.
The Web has properties that enable universal access. Take full advantage of these inherent properties, such as fallbacks, flexibility, and user control, to construct universally usable Web sites.
HTML is the best format for universal usability. Provide documents in nonstandard formats, such as PDF and Flash, only as an alternative to accessible HTML.
Some users navigate the Web using the keyboard only. Make sure ...