Digital accessibility is not a compliance checklist; it is an architectural discipline ensuring digital experiences are operable for users of all abilities.
1. WCAG 2.1 AA Key Compliance Checkpoints
| Accessibility Pillar | Standard Requirement | Implementation Pattern |
|---|---|---|
| Color Contrast | ≥ 4.5:1 for body text; ≥ 3.0:1 for headings/UI | Strict CSS color token testing via automated CI linters |
| Keyboard Navigation | Full logical tab order & visible focus ring | :focus-visible indicators with 3px high-contrast outline |
| Screen Reader Semantics | Proper ARIA roles, landmarks, and live regions | Native HTML5 tags (<main>, <nav>, <header>) over generic divs |
| Form Accessibility | Explicit <label for="..."> association | Deterministic ID pairing + aria-describedby error text |