The document discusses universal design for the web, usability, and accessibility. It defines universal design as the design of products and environments to be usable by all people without need for adaptation. It notes that usability measures the quality of a user's experience on a website, and accessibility involves accommodations for people with disabilities. While a usable site is not necessarily accessible and vice versa, an accessible site is often more usable for all visitors. Reasons for accessibility include ethics, better design for all users, and legal compliance with laws like the ADA.
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