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# 3.3.6 Error Prevention (All)

- Level: AAA
- Guideline: 3.3 Input Assistance
- Principle: 3 Understandable

## What it is

For web pages that require the user to submit information, 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.

## How to test

- Check: Submissions are reversible.
- Check: Data entered by the user is checked for input errors and the user is provided an opportunity to correct them.
- Check: A mechanism is available for reviewing, confirming, and correcting information before finalizing the submission.
- Use the sufficient techniques below as acceptable methods when applicable.

## Sufficient techniques (W3C)

- Following the sufficient techniques for Success Criterion 3.3.4 for all forms that require the user to submit information

## Resources

- WCAG 2.2 SC: https://www.w3.org/TR/WCAG22/#error-prevention-all
- Understanding: https://www.w3.org/WAI/WCAG22/Understanding/error-prevention-all.html
- Quick reference: https://www.w3.org/WAI/WCAG22/quickref/?versions=2.2#error-prevention-all

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