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This specification provides an ontology of roles, states, and properties that define accessible user interface elements and can be used to improve the accessibility and interoperability of web content and applications.

For example, with WAI-ARIA, developers can identify regions of pages and enable keyboard users to easily move among regions, rather than having to press Tab many times.

It is primarily for developers of Web browsers, assistive technologies, and other user agents; developers of Web technologies (technical specifications); and developers of accessibility evaluation tools.