This skill should be used when the user asks to "check accessibility", "audit WCAG compliance", "scan HTML for a11y issues", "check color contrast", or "find accessibility violations in web pages".
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See how to installReview the instructions the agent will receive before you install.
Category: Engineering Domain: Web Accessibility
The Accessibility Audit skill provides automated scanning of HTML files for WCAG 2.1 compliance violations and color contrast checking against AA/AAA standards. It catches missing alt text, broken heading hierarchies, unlabeled form inputs, and insufficient color contrast early in development.
Before running the audit, confirm these inputs. If any is unknown or vague, ASK — do not assume:
--file/--dir/--css arguments)--strict gating and JSON output)Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.
# Scan HTML for WCAG violations
python scripts/a11y_scanner.py --file index.html
# Scan a directory of HTML files
python scripts/a11y_scanner.py --dir ./src/templates
# Check color contrast
python scripts/contrast_checker.py --foreground "#333333" --background "#ffffff"
# Parse CSS file for contrast issues
python scripts/contrast_checker.py --css styles.css
# JSON output for CI
python scripts/a11y_scanner.py --file index.html --format json
Scans HTML files for WCAG 2.1 violations including structural, semantic, and interactive element issues.
| Feature | Description |
|---|---|
| Image alt text | Detects missing or empty alt on non-decorative images |
| Heading hierarchy | Validates h1-h6 levels are sequential |
| Form labels | Ensures inputs have associated label elements |
| ARIA attributes | Checks ARIA usage correctness |
| Link text | Flags generic text like "click here" or "read more" |
| Language attribute | Checks for lang on html element |
| Tab order | Detects positive tabindex values |
| Landmarks | Validates semantic landmark usage |
Checks color contrast ratios against WCAG AA and AAA thresholds.
| Feature | Description |
|---|---|
| Ratio calculation | Computes relative luminance contrast ratio |
| AA compliance | 4.5:1 normal text, 3:1 large text |
| AAA compliance | 7:1 normal text, 4.5:1 large text |
| CSS parsing | Extracts color/background pairs from CSS |
| Color suggestions | Recommends nearest compliant color |
# Gate on Level A violations
python scripts/a11y_scanner.py --dir ./templates --format json --level A --strict
# Check CSS contrast
python scripts/contrast_checker.py --css ./static/css/main.css --format json
| Level | Description | Typical Requirement |
|---|---|---|
| A | Minimum baseline | Legal compliance |
| AA | Industry standard | Most regulations, ADA |
| AAA | Enhanced | Best practice goal |
| Context | AA | AAA |
|---|---|---|
| Normal text (<18pt) | 4.5:1 | 7:1 |
| Large text (>=18pt bold or >=14pt) | 3:1 | 4.5:1 |
| UI components | 3:1 | 3:1 |
| Issue | Fix |
|---|---|
| Missing alt text | <img alt="Description of image"> |
| Skipped heading | Use sequential h1 through h6 |
| No form label | <label for="inputId">Label</label> |
| Generic link text | Replace "click here" with descriptive text |
| Missing lang | <html lang="en"> |
| Positive tabindex | Use tabindex="0" or tabindex="-1" only |
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