All WCAG criteria
WCAG 3.3.4 · UnderstandableLevel AA

3.3.4Error Prevention (Legal, Financial, Data)

For pages that cause legal commitments, financial transactions, or modify/delete user-controllable data, submissions must be reversible, checked, or confirmed.

Common failures

Patterns that fail this criterion.

  • 01Subscription purchase with no order-review step
  • 02Account deletion without confirmation
  • 03Tax form submission without a "review your answers" step
How to test

Testing approach: manual.

Manual — for high-stakes actions, confirm reversibility, an explicit confirm step, OR a clear review step.

How to fix

Remediation steps.

  1. 1

    Add a review step

    Before final submit, show the data the user entered and ask to confirm.

  2. 2

    Allow editing post-submission

    Orders that can be modified within X hours. Form submissions that can be reopened.

  3. 3

    Confirm destructive actions

    Account deletion: confirm dialog + maybe email confirmation link.

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Related criteria

Often appears with…

WCAG 3.3.1 · Level A

Error Identification

All 50 WCAG 2.1 Level A + AA success criteria explained.

View the full checklist