Providing semantic identification and navigation landmarks for supplements like glossaries, indexes, and bibliographies is essential for ensuring quick access and effective use by assistive technologies.

Objectives

• Ensure intuitive and rapid navigation to key sections such as glossaries, indexes, and bibliographies.
• Strengthen semantic accessibility and information discovery for all users, including those using assistive technologies.
• Improve the overall usability of the digital publication by providing efficient access to definitions and references.

Implementation

• In the nav.xhtml file, create a dedicated navigation section for landmarks using a <nav> tag with the epub:type="landmarks" attribute. Inside this tag, list links to the book’s key sections. Each link (<a>) must have an epub:type attribute that semantically identifies the destination (e.g., glossary, index, bibliography).
• Assign the corresponding DPub ARIA role (doc-glossary, doc-index, or doc-bibliography) to the HTML element containing the content in its respective XHTML file, in addition to using the epub:type attributes in the navigation document.
• Consider providing a mechanism, such as a tooltip, to display definitions for technical or specialized terms, starting at least from their first occurrence in each section of the book.

Control

• Verify that any existing glossaries, bibliographies, or indexes appear as corresponding landmarks in the reading system’s navigation panel.
• Confirm the presence of appropriate ARIA roles by reviewing the ACE report, inspecting the source code, or testing with assistive technology.