WCAGAA
How to test criterion 3.3.4 “Error Prevention (Legal, Financial, Data) — 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:”
- WCAG references
- 3.3.4 Error Prevention (Legal, Financial, Data) (AA)
What this criterion says
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.
Official methodology to test criterion 3.3.4
Official W3C techniques
The W3C does not publish a test procedure for this criterion. It publishes techniques instead: documented ways to meet it, and the failures that do not.
Sufficient techniques
Situation A: If an application causes a legal transaction to occur, such as making a purchase or submitting an income tax return:
Situation B: If an action causes information to be deleted:
Situation C: If the web page includes a testing application