Add PageGuard - free WCAG 2.1 AA accessibility checker

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What is PageGuard?

PageGuard is a free website accessibility checker that tests WCAG 2.1 AA compliance and ADA Title II requirements in ~30 seconds — no signup required.

Why it fits in the Web Accessibility section

The Web Accessibility section currently has 2 entries covering guidelines and community resources. PageGuard complements these with a practical tool that frontend developers can use to:

• Test WCAG 2.1 AA compliance — checks color contrast, alt text, ARIA labels, keyboard navigation, HTML lang attributes, and form labels
• Get an actionable score — returns a 0–100 accessibility score with specific issues and plain-English fix recommendations
• Scan any public URL — free, no account required, results in ~30 seconds
• Meet the ADA Title II deadline — April 24, 2026 federal deadline for government websites to comply with WCAG 2.1 AA

Entry added

In compatibility/web-accessibility.md:

+ **[PageGuard](https://pageguard.org/tools/accessibility-checker)**: Free website accessibility checker that tests WCAG 2.1 AA compliance and ADA Title II requirements — returns a 0-100 accessibility score with specific issues to fix in ~30 seconds.