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Almost, but not quite a guide to accessibility requirements
4 Robust

4 Robust

Content must be robust enough that it can be interpreted by a wide variety of user agents, including assistive technologies.

4.1 Compatible

Maximize compatibility with current and future user agents, including assistive technologies.

4.1.1

Conformance level: A

The criterion is now obsolete.

4.1.2

Conformance level: A

Ensure that user interface components have clear names, roles, and states.

4.1.3

Conformance level: AA

Ensure status messages are available to assistive technologies without receiving focus.