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From the Handbook for quality in cultural Web sites Improving quality for citizens, paragraph 2.2:
A Web site is considered to be accessible when the informational content, navigational modes and all the interactive features present are accessible to all users, regardless of disabilities and independently of technology used to access the site and of the context in which they are working whilst accessing the site.
To give an idea of the vastness of the definition, it is worth while quoting the situations described in the introduction to Guidelines - Web Accessibility Initiative (WAI) World Wide Web Consortium (W3C).
For those unfamiliar with accessibility issues pertaining to Web page design, consider that many users may be operating in contexts very different from your own:
Content developers must consider these different situations during page design.
In the contexts described above, particular attention is paid to disabled users or users with specific disabilities, both in terms of reference to instruments which these users may employ for computer use in general, and for navigation on the Web in particular.
Accessibility of museum, library and archive websites: the MLA audit