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kb-playwright-testing

Reference data, not a reviewer. Browser accessibility testing using Playwright and @axe-core/playwright. Keyboard scans, contrast verification, and accessibility tree snapshots.

skills/kb-playwright-testing/SKILL.md

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Nov 7, 2026
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## Playwright Accessibility Testing

Reusable knowledge module for browser-based accessibility testing using Playwright and @axe-core/playwright.

## MCP Tools Available

Each tool the MCP server registers (`mcp-server/tools/playwright-tools.js`), with its purpose and whether it needs @axe-core/playwright. All of them need Playwright with Chromium. There is no state-scan tool: to scan content revealed by an interaction, script the interaction and run `AxeBuilder` yourself (see Scan After Interaction).

| Tool | Purpose | Requires @axe-core/playwright |
|------|---------|------------------------------|
| `run_axe_scan` | axe-core scan of a URL; default tags `wcag2a, wcag2aa, wcag21a, wcag21aa, wcag22aa` | Yes |
| `run_playwright_keyboard_scan` | Tab-order traversal, focus visibility, keyboard trap detection | No |
| `run_playwright_viewport_scan` | Horizontal scrolling at 320, 768, 1024 and 1280 CSS px (1.4.10 Reflow only; no zoom, text resize or target-size check) | No |
| `run_playwright_contrast_scan` | Computed-style text contrast against the AA thresholds (4.5:1, or 3:1 for large text) | No |