3.3.4 Error Prevention – Legal, Financial, Data (Level AA)

Provide ample opportunity for users to review and correct any potential errors, especially those that may have a big impact.

What you need to know

  • It’s extremely easy to make submission errors (e.g., selecting the wrong flight date). This is why it’s so crucial that we provide users with ample opportunity to review, correct, and/or reverse any submissions they make on our website.
  • For any web pages that have important implications (legal commitments, rights waivers, spending money, scheduling reservations, etc.), make sure that you provide at least one of the following options:
    1. Submissions are reversible.
    2. Input is checked for errors and the user is provided an opportunity to correct errors.
    3. There is an option to review, confirm, and correct information before finalizing the submission.

What you need to do

Provide at least one way to undo or reverse a submission so users get their desired result and don’t make a significant error.


Read the full explanation of success criterion 3.3.4 on

Related Resource

Check out “Providing success feedback when data is submitted successfully” from W3C’s Web Accessibility Initiative for more information about this success criterion.