# Accessibility Scanner Categories ### Category 1: Semantic Structure & Landmarks WCAG 1.3.1 (Info and Relationships), 2.4.1 (Bypass Blocks), 2.4.6 (Headings and Labels), 3.1.1 (Language of Page), 3.1.2 (Language of Parts). | Pattern | Severity | Confidence | Description | |---------|----------|------------|-------------| | `` missing `lang` attribute | HIGH | definitive | WCAG 3.1.1 | | Mixed-language content without `` wrapper (heuristic: non-Latin characters in otherwise-Latin content) | WARN | heuristic | WCAG 3.1.2 | | Page/route component with >1 `

` | WARN | heuristic | WCAG 1.3.1 | | Heading level skip (h1 → h3 without h2) | WARN | heuristic | WCAG 1.3.1 | | No landmark roles / semantic elements (`
`, `
`, `
`, `
`) | WARN | heuristic | WCAG 1.3.1, 2.4.1 | | `role="presentation"` / `role="none"` on semantic element | WARN | definitive | Strips meaning; misuse of ARIA | | Multiple `
` per page | HIGH | definitive | WCAG 1.3.1 — only one `
` allowed | ### Category 2: Text Alternatives & Non-Text Content WCAG 1.1.1 (Non-text Content). | Pattern | Severity | Confidence | Description | |---------|----------|------------|-------------| | `` without `alt` attribute | HIGH | definitive | WCAG 1.1.1 — required even if empty | | `` on informational image (heuristic: image inside `
`, `
`, or with adjacent caption) | WARN | heuristic | Empty alt only for decorative | | `` / `` / `` (redundant/meaningless) | WARN | definitive | Alt should describe content | | `