WCAG 3.3.4 Error Prevention (Legal, Financial, Data)
For forms involving legal commitments, financial transactions or the deletion of user-controllable data, submissions must be reversible, checked for errors before finalizing, or confirmed before completing.
Table of contents
What WCAG 3.3.4 Requires
For forms involving legal commitments, financial transactions or the deletion of user-controllable data, submissions must be reversible, checked for errors before finalizing, or confirmed before completing.
How to Test It by Hand
Complete a checkout, account deletion or similar high-stakes form and check for a review or confirmation step before it finalizes.
Common Failures
- A "delete account" button executes immediately with no confirmation step.
- A purchase finalizes with no order review screen.
Testing WCAG 3.3.4 With AccessBell
This criterion depends on meaning or context, so it needs a person to judge. AccessBell's report lists it for manual review rather than marking it pass or fail automatically, so it is not missed.
Run a free scan to spot issues on your own pages.
Related Criteria in Input Assistance
- 3.3.1 Error Identification (Level A, WCAG 2.0)
- 3.3.2 Labels or Instructions (Level A, WCAG 2.0)
- 3.3.3 Error Suggestion (Level AA, WCAG 2.0)
- 3.3.5 Help (Level AAA, WCAG 2.0)
- 3.3.6 Error Prevention (All) (Level AAA, WCAG 2.0)
- 3.3.7 Redundant Entry (Level A, WCAG 2.2)
- 3.3.8 Accessible Authentication (Minimum) (Level AA, WCAG 2.2)
- 3.3.9 Accessible Authentication (Enhanced) (Level AAA, WCAG 2.2)
Frequently Asked Questions
What does WCAG 3.3.4 require?
For forms involving legal commitments, financial transactions or the deletion of user-controllable data, submissions must be reversible, checked for errors before finalizing, or confirmed before completing.
Can AccessBell test WCAG 3.3.4 automatically?
Not fully. This criterion needs a person to judge, so AccessBell's report lists it for manual review rather than marking it pass or fail on its own.
What level is WCAG 3.3.4?
Level AA, added in WCAG 2.0. Level AA is the level referenced by the ADA, Section 508 and most accessibility laws.
Sources
- W3C: Understanding 3.3.4 Error Prevention (Legal, Financial, Data) (opens in a new tab)
- W3C: Web Content Accessibility Guidelines (WCAG) 2.2 (opens in a new tab)
This page explains a technical standard and is not legal advice. See our disclaimer.