What the site provides
- Keyboard-operable navigation, wizard, filters and graph alternatives.
- Visible focus, high-contrast light and dark themes and non-colour state cues.
- A reflowing editorial list equivalent to the relationship atlas.
- Reduced-motion behaviour and no continuous animation.
- Semantic headings, landmarks, labels, status announcements and text alternatives.
Known verification boundary
Automated and browser-based accessibility checks are part of the release workflow, but they detect only a subset of barriers and do not establish conformance on their own. Keyboard-only use, zoom and reflow, reduced motion, forced colours and assistive-technology behaviour require periodic human testing. If a feature is difficult to use, the pattern indexes and canonical repository remain alternative routes to the same public content.
Standards basis
Implementation decisions follow the W3C Web Content Accessibility Guidelines 2.2.