Accessibility Audit

Purpose

Unified WCAG 2.2 accessibility audit covering all 86 success criteria across 4 POUR principles (Perceivable, Operable, Understandable, Robust).

Two modes:

• Crawl mode: Provide pages: [{url, html}] and get per-page scoring (0-100) with ranking, site aggregate, and detailed per-criterion findings. Manual-only criteria are flagged with manual_reason.
• Session mode: Query the user's required WCAG level (A, AA, or AAA) and receive the complete checklist. The agent enforces all criteria in the checklist throughout the session.

Two analysis engines:

• Regex engine (built-in, zero dependencies): 13 regex-based scoring functions covering the 41 fully automatable criteria (~48% of all 86; per wcag-criteria.ts automatable flags).
• axe-core engine (optional, pnpm add axe-core): 57 rule checks providing ~80% automated coverage. Auto-detected at import time — silent fallback if not installed.

Boundaries

Always

• Score real HTML against all automatable criteria
• Return structured per-criterion results with WCAG SC ID references
• Distinguish automated findings from manual-review items

Never

• Claim legal compliance
• Score criteria requiring visual inspection as if automated
• Make external network calls

Level-Aware Scoring

• Color contrast: no Level A requirement; AA=4.5:1 normal text / 3:1 large text (SC 1.4.3); AAA=7:1 / 4.5:1 (SC 1.4.6)
• Level A: 31 criteria (18 automatable, 4 partial)
• Level AA: 55 criteria cumulative (31 automatable, 8 partial)
• Level AAA: 86 criteria cumulative (41 automatable, 15 partial)

References

Implementation guidance and enterprise patterns (merged from wcag-aaa-web-design):

• references/wcag-aaa-checklist.md — all 86 WCAG 2.2 criteria with implementation guidance and AAA design implications
• references/corporate-design-system.md — AAA-verified color palette with precomputed contrast ratios, type scale, BEM architecture
• references/aria-patterns.md — ARIA widget patterns (modals, tabs, accordions, focus traps)
• references/form-patterns.md — accessible form design and validation
• references/security-error-handling.md — OWASP-aligned secure error handling (CSP, CSRF, output encoding)
• references/application-states.md — loading, empty, and error state patterns
• references/data-presentation.md — accessible data table and density patterns
• references/navigation-patterns.md — sidebar, breadcrumb, and wayfinding patterns
• references/responsive-breakpoints.md — mobile-first breakpoint system
• references/corporate-ux-patterns.md — enterprise UX conventions

Templates

AAA-verified starter templates in templates/: design tokens with precomputed 7:1 contrast palette (tokens.css), BEM component library (components.css), semantic HTML partials, and defensive vanilla JS (main.js). A standalone contrast checker with auto-suggestion engine is included as templates/check_contrast.py (stdlib-only Python; can audit --color-* tokens directly from tokens.css).