How do I test for WCAG 2.3.1 compliance?

To test Three Flashes or Below: 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 A

WCAG 2.3.1: Three Flashes or Below

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Success Criterion 2.3.1 — Level A

Quick Answer

Pages must not contain content that flashes more than 3 times per second.

Why It Matters

Flashing content can trigger photosensitive epileptic seizures in susceptible users.

How to Audit

Run an automated accessibility scan to detect common Three Flashes or Below 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 Three Flashes or Below issues — manual testing is essential.

How to Fix

Remove or redesign any content that flashes rapidly. Use the Harding Test tool to validate.

Frequently Asked Questions

What is WCAG 2.3.1 Three Flashes or Below?

Pages must not contain content that flashes more than 3 times per second.

Is WCAG 2.3.1 required for ADA compliance?

WCAG 2.1 Level A is the minimum baseline for ADA website compliance. Courts have upheld WCAG 2.1 AA as the standard for ADA Title III lawsuits.

How do I fix WCAG 2.3.1 violations?

Remove or redesign any content that flashes rapidly. Use the Harding Test tool to validate.

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.

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