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CEDIS

Accessibility

CEDIS works to make this site usable by people with different types of disabilities, following the Web Content Accessibility Guidelines (WCAG) 2.1 at level AA.

Features already in place

  • “Skip to content” link at the top of every page.
  • Color contrast tested in light and dark modes.
  • Keyboard navigation with visible focus.
  • ARIA labels on interactive components (menus, theme buttons, forms).
  • Textual alternatives (alt) on content images.
  • Semantic structure with proper heading hierarchy.
  • Support for reduced motion (prefers-reduced-motion).

Continuous validation

  • Automated validation with Pa11y integrated into CI for critical pages (WCAG 2.0 AA).
  • Lighthouse CI audit on both desktop and mobile.
  • Accessibility and Lighthouse reports attached as workflow artifacts.
  • Complementary manual reviews on critical flows with screen readers, keyboard navigation, dark mode, and 200% and 400% zoom.

Latest empirical measurement (2026-07-27)

  • Pa11y (WCAG 2.0 AA): 0 errors across 15 representative URLs.
  • Lighthouse desktop accessibility: 100 on 8/8 pages (average 100).
  • Lighthouse mobile accessibility: 100 on 8/8 pages (average 100).
  • Lighthouse SEO: 100 on every measured page.
  • Lighthouse best practices: 96 on every measured page.

These numbers are revalidated on every layout or palette change.

Report a barrier

Struggling to use the site? Write to cedis@unb.br describing the page, what you tried to do, and what happened. Barriers identified by users take priority in the correction queue.

Standards followed

  • WCAG 2.1 level AA (international reference).
  • eMAG (Brazilian Electronic Government Accessibility Model), where applicable.
  • Brazilian Inclusion Law (Law 13.146/2015).