Design Nomenclature / Systems & Spec
Level AAA
Also called WCAG AAA, AAA conformance, triple-A
This entry has not been translated yet and is shown in English.
The highest WCAG conformance level: text contrast 7:1, or 4.5:1 for large text, alongside criteria such as enhanced target size at 44×44 CSS px. WCAG itself states that AAA is not recommended as a general policy for entire sites, because some content cannot satisfy every AAA criterion.
In practice
Treated as the gold star to aim for. In practice it is applied to chosen criteria on chosen content; site-wide AAA is a claim the standard advises against making.
Not to be confused with
- Level AAThe middle WCAG conformance level, and the one policy nearly always specifies. Requires every Level A and Level AA criterion: text contrast 4.5:1, or 3:1 for large text — 18.66px bold or 24px regular; non-text contrast 3:1; reflow to 320 CSS px; and, from 2.2, target size 24×24 CSS px.
- WCAGThe W3C's Web Content Accessibility Guidelines: testable success criteria filed under four principles and graded A, AA, or AAA. Conformance is claimed per page, against a stated version, and each level subsumes the ones below. It measures conformance — not whether disabled people can actually complete the task.