Principles for prioritization of DPUB ARIA roles

Principles

• Support a three-level priority model (high, medium, low) to align with common AT verbosity settings.
• Roles that change user focus or navigation (e.g., links to other locations like footnotes, backlinks) should be high priority.
• Medium priority applies to information conveyed visually through layout, styling, or positioning (e.g., dedication, epigraph), which is obvious to visual readers but not so obvious to non-visual readers.
• Low priority applies when the role is already clear from headings (e.g., appendix, bibliography).
• Reduce the priority when repetition would create unnecessary verbosity or noise.
• Consider special cases (e.g., page numbers, skippable structures) where user context determines usefulness.