How do I test for WCAG 1.4.3 compliance?

To test Contrast Minimum: use automated tools like AltorLab's scanner for initial detection, then manually verify with keyboard navigation and screen reader testing. Check the specific failure modes described in the WCAG documentation.

🔵 Level AA

WCAG 1.4.3: Contrast Minimum

Name: AI Room Redesign
Price: 9 USD

Success Criterion 1.4.3 — Level AA

Quick Answer

Normal text must have a contrast ratio of at least 4.5:1 against its background. Large text needs 3:1.

Why It Matters

Low contrast text is unreadable for users with low vision or color blindness. This is the most common AA failure.

How to Audit

Run an automated accessibility scan to detect common Contrast Minimum failures. Then manually verify with: keyboard-only navigation, a screen reader (VoiceOver on Mac, NVDA on Windows), and browser developer tools. Automated tools catch approximately 40% of Contrast Minimum issues — manual testing is essential.

How to Fix

Use the WebAIM Contrast Checker. Ensure all body text meets 4.5:1. Large text (18pt+) needs 3:1.

Frequently Asked Questions

What is WCAG 1.4.3 Contrast Minimum?

Normal text must have a contrast ratio of at least 4.5:1 against its background. Large text needs 3:1.

Is WCAG 1.4.3 required for ADA compliance?

WCAG 2.1 Level AA is the standard referenced in most ADA website lawsuits and DOJ guidance. All Level AA criteria including this one are relevant to legal compliance.

How do I fix WCAG 1.4.3 violations?

Use the WebAIM Contrast Checker. Ensure all body text meets 4.5:1. Large text (18pt+) needs 3:1.

Disclaimer: This guide is for informational purposes only and does not constitute legal advice. Consult a qualified ADA/accessibility attorney for your specific compliance situation.

Scan Your Site for WCAG 1.4.3 Issues

Get a free automated accessibility report including all WCAG 2.1 AA violations.

Run Free Accessibility Scan