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WCAG definition of role

text or number by which software can identify the function of a component within Web content

Example: A number that indicates whether an image functions as a hyperlink, command button, or check box.

Additional guidance when applying to Electronic Documents and Software Aspects of Products

This applies directly as written, and as described in WCAG 2.0 glossary replacing "Web Content" with "Content".

NOTE: "AccessibleRole" (or however it is called in different APIs) of the Accessibility API of the platform is an example of such a role.