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added link to WHATWG wiki page on media accessibility
Accessibility for Web audio & video is an interesting beast. It is mainly referred as a need of extending content with functionality to allow [http://www.w3.org/WAI/EO/Drafts/PWD-Use-Web/ people of varying disabilities] (in particular deaf / blind) access to Web content.
However, such functionalities are not only usable by disabled people - they become quickly very useful to people that are not generally regarded as "disabled", e.g. subtitles for internationalisation or in loud environments, or the "mis"-use of captions for deep search and direct access to subparts of a video. (See for example the [http://wiki.whatwg.org/wiki/Video_accessibility use cases at WHATWG wiki]).
Therefore, the analysis of requirements for accessibility cannot stop at the requirements for disabled people, but will need to go further.
