Level AAASince WCAG 2.0
3.3.6 Error Prevention (All)
Guideline 3.3: Input Assistance – Forms help people avoid and correct mistakes.
What does the rule require?
For all forms – not just important ones – people can review, correct or undo their input.
How to get it right
Offer a summary before every submission or an undo function afterwards.
Who benefits most?
- People with cognitive disabilities
- People with motor disabilities
Official wording
This page explains the rule in simple words. Only the original W3C text is normative.
- “Understanding Error Prevention (All)” at W3C (external site)
- Techniques in the WCAG Quick Reference (external site)