Level AASince WCAG 2.0
3.3.4 Error Prevention (Legal, Financial, Data)
Guideline 3.3: Input Assistance – Forms help people avoid and correct mistakes.
What does the rule require?
For important actions such as purchases, contracts, test answers or deleting data, people can review, correct or undo their input.
How to get it right
Show a summary page with “Change” links and a clear “Place order and pay” button before the purchase.
Who benefits most?
- People with cognitive disabilities
- People with motor disabilities
- Everyone
Official wording
This page explains the rule in simple words. Only the original W3C text is normative.
- “Understanding Error Prevention (Legal, Financial, Data)” at W3C (external site)
- Techniques in the WCAG Quick Reference (external site)