WAI-ARIA 1.3, still a draft, focuses on enhancing document semantics, annotations, and braille output for rich document editors and complex interfaces. New features include roles for suggestions, comments, and marked content, as well as attributes for accessible descriptions and braille-specific labels and role descriptions. While these features offer greater flexibility, developers should prioritize native HTML semantics and thoroughly test implementations before relying on them in production.

ARIA 1.3 introduces changes to improve accessibility for complex web applications. These include allowing aria-details and aria-errormessage to reference multiple elements, clarifying the use of aria-haspopup, and aligning aria-level with HTML heading levels. While these features offer more expressive accessibility, developers should use them cautiously and prioritize native HTML whenever possible.