Understandable / 3.3 Input Assistance
3.3.4Error Prevention (Legal, Financial, Data)
Level AAFor actions with serious, hard-to-reverse consequences -- finalizing a contract or payment, deleting or changing user-controlled data, or submitting test answers -- offer at least one of three safeguards: the action can be undone, the input is automatically checked for errors, or the user can review and confirm before submitting. Only one of the three is required; a confirmation screen before final submission is the most common way to satisfy it.
Note
A detailed commentary for this success criterion is not yet available. In the meantime, this page lists related patterns, techniques, and links to the normative sources.
Related Techniques
Specific implementation techniques for meeting this success criterion. This site doesn't include the full text, so follow the links to the original W3C documents.
Sufficient Techniques(5)
- G98: Providing the ability for the user to review and correct answers before submitting(opens in a new tab)waic.jp(opens in a new tab)
- G99: Providing the ability to recover deleted information(opens in a new tab)waic.jp(opens in a new tab)
- G155: Providing a checkbox in addition to a submit button(opens in a new tab)waic.jp(opens in a new tab)
- G164: Providing a stated time within which an online request (or transaction) may be amended or canceled by the user after making the request(opens in a new tab)waic.jp(opens in a new tab)
- G168: Requesting confirmation to continue with selected action(opens in a new tab)waic.jp(opens in a new tab)
Normative References
- Success Criterion 3.3.4 Error Prevention (Legal, Financial, Data) — WCAG 2.2(opens in a new tab)The normative requirement text.
- Understanding Error Prevention (Legal, Financial, Data) — W3C(opens in a new tab)Official guidance on intent, examples, and techniques.