How do I test for WCAG 1.4.10 compliance?

To test Reflow: 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 1.4.10: Reflow

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Success Criterion 1.4.10 — Level AA

Quick Answer

Content must reflow to a single column at 320px width without horizontal scrolling.

Why It Matters

Users with low vision who zoom to 400% effectively see a 320px viewport. Horizontal scrolling is inaccessible.

How to Audit

Run an automated accessibility scan to detect common Reflow 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 Reflow issues — manual testing is essential.

How to Fix

Use responsive design. Test at 320px width with 400% browser zoom.

Frequently Asked Questions

What is WCAG 1.4.10 Reflow?

Content must reflow to a single column at 320px width without horizontal scrolling.

Is WCAG 1.4.10 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 1.4.10 violations?

Use responsive design. Test at 320px width with 400% browser zoom.

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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