USC 3.3.4: Error Prevention (Legal, Financial, Data)

Understanding Success Criterion 3.3.4 Error Prevention (Legal, Financial, Data)

Provide an option for users to at least reverse, check, or confirm their input text while submitting information on the web page for only Legal, Financial, and user-controllable data websites.

Official Requirements

Success Criterion 3.3.4 Error Prevention (Legal, Financial, Data) (Level AA): For Web pages that cause legal commitments or financial transactions for the user to occur, that modify or delete user-controllable data in data storage systems, or that submit user test responses, at least one of the following is true:

Reversible: Submissions are reversible.

Checked: Data entered by the user is checked for input errors and the user is provided an opportunity to correct them.

Confirmed: A mechanism is available for reviewing, confirming, and correcting information before finalizing the submission.

Why is it required?

Users with reading disabilities may transpose numbers with letters making it difficult for them to understand the content. Similarly, users with motor impairments may hit keys by mistake and fill up forms with the incorrect input text. Therefore, providing an option to reverse their actions will help them to rectify any mistakes. Whereas, providing an option to review and correct information will help users to identify mistakes before submission.

How do we fix it?

  • Give users a chance to review their input text before finalization or submission.
  • Always get user consent before performing any irreversible actions
  • Provide an option to recover data when the user’s action may result in deleting information
  • Get user content before continuing with the selected action when the web page includes a testing application.

Are there any exceptions?

This criterion only applies to web pages that cause legal commitments or financial transactions for the user, that modify or delete user-controllable data in data storage systems, or submit user test responses.

Picture of Aditya Bikkani

Aditya Bikkani

Aditya is the COO of AELData, a growing technology company in the Digital Publishing and Education sectors. He is also an entrepreneur and founder of an accessibility tool called LERA. A W3C COGA (Cognitive and Learning Disabilities Accessibility) Community Member Aditya contributes to researching methodologies to improve web accessibility and usability for people with cognitive and learning disabilities.

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