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It maps existing,
well-known concepts from the operating system to the browser by:
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Adding semantic
meaning to meaningless markup: “provides a means of describing... custom
widgets so that they are recognisable and usable by assistive technology
users.” (http://dev.opera.com/articles/view/introduction-to-wai-aria/)
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Communicating dynamic
content updates (AJAX) to assistive technology.
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Providing consistent
keyboard support for interactive interface elements.
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