According to Tim Berners-Lee at
http://www.w3.org/WAI/:
The power of the Wewb is in its universality. Access by everyone
regardless of disability is an essential aspect.
Web Design Steps
determine the Intended Audience
The colors, images, fonts, and layout should be tailored to the
preferences of your audience.The type of site content
(reading level, amount of animation, etc.) should be approrpiate for
your chosen audience.