web-severity-scoring

Original：🇺🇸 English

Translated

Severity scoring, scorecard computation, confidence levels, and remediation tracking for web accessibility audits. Use when computing page accessibility scores (0-100 with A-F grades), tracking remediation progress across audits, or generating cross-page comparison scorecards.

4installs

Sourcecommunity-access/accessibility-agents

Added on2026-03-29

NPX Install

npx skill4agent add community-access/accessibility-agents web-severity-scoring

SKILL.md Content

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Web Severity Scoring

Severity Scoring Formula

text

Page Score = 100 - (sum of weighted findings)

Weights:
  Critical (high confidence, both sources):  -15 points
  Critical (high confidence, single source): -10 points
  Critical (medium confidence):               -7 points
  Critical (low confidence):                  -3 points
  Serious (high confidence):                  -7 points
  Serious (medium confidence):                -5 points
  Serious (low confidence):                   -2 points
  Moderate (high confidence):                 -3 points
  Moderate (medium confidence):               -2 points
  Moderate (low confidence):                  -1 point
  Minor:                                      -1 point

Floor: 0 (minimum score)

Score Grades

Score	Grade	Meaning
90-100	A	Excellent - minor or no issues, meets WCAG AA
75-89	B	Good - some issues, mostly meets WCAG AA
50-74	C	Needs Work - multiple issues, partial WCAG AA compliance
25-49	D	Poor - significant accessibility barriers
0-24	F	Failing - critical barriers, likely unusable with AT

Confidence Levels

Level	Weight	When to Use
High	100%	Confirmed by axe-core + agent, or definitively structural (missing alt, no labels, no lang)
Medium	70%	Found by one source, likely issue (heading edge cases, questionable ARIA, possible keyboard traps)
Low	30%	Possible issue, needs human review (alt text quality, reading order, context-dependent link text)

Source Correlation

Issues found by both axe-core AND agent review are automatically upgraded to high confidence regardless of individual confidence ratings.

Scorecard Format

Single Page

markdown

## Accessibility Score

| Metric | Value |
|--------|-------|
| Page | [URL] |
| Score | [0-100] |
| Grade | [A-F] |
| Critical | [count] |
| Serious | [count] |
| Moderate | [count] |
| Minor | [count] |

Multi-Page

markdown

## Accessibility Scorecard

| Page | Score | Grade | Critical | Serious | Moderate | Minor |
|------|-------|-------|----------|---------|----------|-------|
| / | 82 | B | 0 | 2 | 3 | 1 |
| /login | 91 | A | 0 | 0 | 2 | 1 |
| /dashboard | 45 | D | 2 | 4 | 3 | 2 |
| **Average** | **72.7** | **C** | **2** | **6** | **8** | **4** |

Cross-Page Pattern Classification

Pattern Type	Definition	Remediation ROI
Systemic	Same issue on every audited page	Highest - usually layout/nav, fix once
Template	Same issue on pages sharing a component	High - fix the shared component
Page-specific	Unique to one page	Normal - fix individually

Remediation Tracking

Change Classification

Status	Definition
Fixed	Issue was in previous report but no longer present
New	Issue not in previous report, appears now
Persistent	Issue remains from previous report
Regressed	Issue was previously fixed but has returned

Progress Metrics

Issue reduction:
```
(fixed / previous_total) * 100
```
Score change:
```
current_score - previous_score
```
Pages improved: count of pages with higher scores than previous audit
Trend: improving (score up 5+), stable (within 5), declining (score down 5+)

Issue Severity Categories

Critical

No keyboard access to essential functionality
Missing form labels on required fields
Images conveying critical information have no alt text
Color is the sole means of conveying information
Keyboard traps with no escape

Serious

Missing skip navigation
Poor heading hierarchy (skipped levels)
Focus not visible on interactive elements
Form errors not programmatically associated
Missing ARIA on custom widgets

Moderate

Redundant ARIA on semantic elements
Suboptimal heading structure (multiple H1s)
Missing autocomplete on identity fields
Links to new tabs without warning
Missing table captions

Minor

Redundant title attributes
Suboptimal button text
Missing landmark roles where semantic elements exist
Decorative images with non-empty alt text