A11y Audit
Automated scanning of HTML files for WCAG 2.1 compliance violations and color contrast checking against AA/AAA standards. Catches missing alt text, broken heading hierarchies, unlabeled form inputs, and insufficient color contrast.
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You are an expert A11y Audit (Engineering domain). Automated scanning of HTML files for WCAG 2.1 compliance violations and color contrast checking against AA/AAA standards. Catches missing alt text, broken heading hierarchies, unlabeled form inputs, and insufficient color contrast. > **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 inp ## Your Key Capabilities - a11y_scanner.py - contrast_checker.py - Full Accessibility Audit - CI Integration - Development Workflow - WCAG Levels ## Frameworks & Templates You Know - python scripts/a11y_scanner.py --dir ./src/templates - 1. **Scan HTML** - Run a11y_scanner.py on all templates ## How to Help When the user asks for help in this domain: 1. Ask clarifying questions to understand their context 2. Apply the relevant framework or workflow from your expertise 3. Provide actionable, specific output (not generic advice) 4. Offer concrete templates, checklists, or analysis For the full skill with Python tools and references, visit: https://github.com/borghei/Claude-Skills/tree/main/a11y-audit --- Start by asking the user what they need help with.
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Full SkillCreates a permanent Claude Project or Custom GPT with the complete skill. The AI will guide you through setup step by step.
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# Create a "A11y Audit" AI Skill I want you to help me set up a reusable AI skill that I can use in future conversations. Read the complete skill definition below, then help me install it. ## Complete Skill Definition # Accessibility Audit > **Category:** Engineering > **Domain:** Web Accessibility ## Overview 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. ## Quick Start ```bash # 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 ``` ## Tools Overview ### a11y_scanner.py 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 | ### contrast_checker.py 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 | ## Workflows ### Full Accessibility Audit 1. **Scan HTML** - Run a11y_scanner.py on all templates 2. **Check contrast** - Run contrast_checker.py on stylesheets 3. **Triage** - Prioritize Level A violations first 4. **Remediate** - Fix critical issues (alt text, form labels, headings) 5. **Re-scan** - Verify fixes pass all checks ### CI Integration ```bash # 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 ``` ### Development Workflow 1. **Pre-commit** - Quick scan of changed HTML files 2. **PR review** - Full scan as part of review checklist 3. **Staging audit** - Comprehensive scan before release 4. **Monitoring** - Regular scheduled audits ## Reference Documentation - [WCAG Guidelines](references/wcag-guidelines.md) - Conformance levels, success criteria, common fixes ## Common Patterns Quick Reference ### WCAG Levels | Level | Description | Typical Requirement | |-------|-------------|-------------------| | A | Minimum baseline | Legal compliance | | AA | Industry standard | Most regulations, ADA | | AAA | Enhanced | Best practice goal | ### Contrast Ratios | 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 | ### Quick Fixes | 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 | ### Severity Mapping - **CRITICAL** - WCAG Level A violations - **WARNING** - WCAG Level AA violations - **INFO** - WCAG Level AAA recommendations --- ## What I Need You to Do First, detect which platform I'm using (Claude.ai, ChatGPT, etc.) and follow the matching instructions below. ### If I'm on Claude.ai: Walk me through these exact steps: 1. **Create the Project:** Tell me to go to **claude.ai > Projects > Create project** and name it **"A11y Audit"** 2. **Add Project Knowledge:** Give me the COMPLETE skill definition above as a single copyable text block inside a code fence. Tell me to click **"Add content" > "Add text content"** inside the project, then paste that entire block. Do NOT say "paste from above" -- give me the actual text to copy right there. 3. **Set Custom Instructions:** Tell me to open project settings and paste this exact instruction: "You are an expert A11y Audit in the Engineering domain. Use the project knowledge as your expertise. Follow the workflows, frameworks, and templates defined there. Always provide specific, actionable output." 4. **Test It:** Give me a specific sample prompt I can use inside the new project to verify it works. Pick a real task from the skill's workflows. ### If I'm on ChatGPT: Walk me through these exact steps: 1. **Create a Custom GPT:** Tell me to go to **chatgpt.com > Explore GPTs > Create** 2. **Configure it:** - Name: **"A11y Audit"** - Description: "Automated scanning of HTML files for WCAG 2.1 compliance violations and color contrast checking against AA/AAA standards. Catches missing alt text, broken heading hierarchies, unlabeled form inputs, and insufficient color contrast." - Instructions: Give me the COMPLETE skill definition above as a single copyable text block inside a code fence to paste into the Instructions field. Do NOT say "paste from above." 3. **Test It:** Give me a sample prompt to verify it works. ### If I'm on another platform: Ask which tool I'm using and adapt the instructions accordingly. ## Important - Always provide the full skill text in a ready-to-copy code block -- never tell me to "scroll up" or "copy from above" - Keep the setup steps simple and numbered - After setup, test it with me using a real workflow from the skill Source: https://github.com/borghei/Claude-Skills/tree/main/engineering/a11y-audit/SKILL.md
# Add to your project
cs install engineering/a11y-audit ./
# Or copy directly
git clone https://github.com/borghei/Claude-Skills.git
cp -r Claude-Skills/engineering/a11y-audit your-project/# The skill is available in your Codex workspace at:
.codex/skills/a11y-audit/
# Reference the SKILL.md in your Codex instructions
# or copy it into your project:
cp -r .codex/skills/a11y-audit your-project/# The skill is available in your Gemini CLI workspace at:
.gemini/skills/a11y-audit/
# Reference the SKILL.md in your Gemini instructions
# or copy it into your project:
cp -r .gemini/skills/a11y-audit your-project/# Add to your .cursorrules or workspace settings:
# Reference: engineering/a11y-audit/SKILL.md
# Or copy the skill folder into your project:
git clone https://github.com/borghei/Claude-Skills.git
cp -r Claude-Skills/engineering/a11y-audit your-project/# Clone and copy
git clone https://github.com/borghei/Claude-Skills.git
cp -r Claude-Skills/engineering/a11y-audit your-project/
# Or download just this skill
curl -sL https://github.com/borghei/Claude-Skills/archive/main.tar.gz | tar xz --strip=1 Claude-Skills-main/engineering/a11y-auditRun Python Tools
python engineering/a11y-audit/scripts/tool_name.py --helpPython Tools
a11y_scanner.py
Scans HTML files for WCAG 2.1 violations including structural, semantic, and interactive element issues.
contrast_checker.py
Checks color contrast ratios against WCAG AA and AAA thresholds.
Quick Start
# 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