Severity Mapping
Canonical severity definitions shared across web, document, and markdown audit domains.
Canonical Severity Levels
Each level, with its definition, WCAG conformance and score impact.
| Level | Definition | WCAG Conformance | Score Impact |
|---|---|---|---|
| Critical | Blocks access entirely for one or more user groups. No workaround exists. | Fails Level A | -15 to -22 points |
| Serious | Severely impairs access; a workaround may exist but is unreasonable. | Fails Level A or AA | -5 to -10 points |
| Moderate | Causes friction or confusion; most users can still complete the task. | Fails Level AA (advisory) | -2 to -4 points |
| Minor | Polish issue; no meaningful barrier for most users. | Technique deviation | -1 point |
Cross-Domain Equivalents
Each canonical level, with its web (axe-core or playwright), document (office or PDF) and markdown.
| Canonical Level | Web (axe-core / Playwright) | Document (Office/PDF) | Markdown |
|---|---|---|---|
| Critical | critical (axe-core) |
Missing document title; untagged PDF; missing heading structure | Broken anchor link leading to dead navigation |
| Serious | serious (axe-core) |
Missing alt text on informational image; table has no headers | Ambiguous link text (e.g., "click here"); missing alt text on image |
| Moderate | moderate (axe-core) |
Merged table cells; color-only data encoding | Skipped heading level; missing table caption |
| Minor | minor (axe-core) |
Decorative image with non-empty alt; redundant bookmark | Emoji in heading; em-dash used as list separator |
Score Impact Rules
Score impacts listed above are additive per finding. When the same issue recurs across many elements:
- First occurrence — full deduction
- Same issue type, same page/file — no additional deduction (already counted once per issue rule)
- Same issue type, different page/file — full deduction applies again to the new page/file score
Conversion Rules (Normalizing Cross-Domain Reports)
When generating a unified report that combines web, document, and markdown findings:
- Map each finding to the canonical severity level using the table above.
- Apply the score impact from the canonical level, not from the domain-specific tool's internal scoring.
- For aggregated scores (portfolio or project level), compute each page/file score independently, then average.
- Do not double-count a finding that appears in both an axe-core scan and a Playwright behavioral scan -- deduplicate by rule ID and element location.
Confidence Modifier (Web Domain)
For web audits, confidence level modifies the base deduction:
| Confidence | Multiplier | Source Signals |
|---|---|---|
| Confirmed | 1.2x | axe-core + agent code review + Playwright behavioral test |
| High (two sources) | 1.0x | Any two of the three sources above |
| High (one source) | 1.0x (reduced base) | Single automated tool, high rule reliability |
| Medium | 0.7x | Single source, medium rule reliability |
| Low | 0.3x | Single source, low rule reliability or heuristic |
Document and markdown audits do not use confidence multipliers -- they use the base score impact only.