44 lines
2.0 KiB
Markdown
44 lines
2.0 KiB
Markdown
[Back to 3 Understandable index](index.html)
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# 3.3.4 Error Prevention (Legal, Financial, Data)
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- Level: AA
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- Guideline: 3.3 Input Assistance
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- Principle: 3 Understandable
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## What it is
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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:
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- **Reversible:** Submissions are reversible.
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- **Checked:** Data entered by the user is checked for input errors and the user is provided an opportunity to correct them.
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- **Confirmed:** A mechanism is available for reviewing, confirming, and correcting information before finalizing the submission.
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## How to test
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- Check: Submissions are reversible.
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- Check: Data entered by the user is checked for input errors and the user is provided an opportunity to correct them.
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- Check: A mechanism is available for reviewing, confirming, and correcting information before finalizing the submission.
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- Use the sufficient techniques below as acceptable methods when applicable.
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## Sufficient techniques (W3C)
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- G164: Providing a stated time within which an online request (or transaction) may be amended or canceled by the user after making the request
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- G98: Providing the ability for the user to review and correct answers before submitting
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- G155: Providing a checkbox in addition to a submit button
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- G99: Providing the ability to recover deleted information
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- G168: Requesting confirmation to continue with selected action
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## Advisory techniques (W3C)
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- SCR18: Providing client-side validation and alert
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- G199: Providing success feedback when data is submitted successfully
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## Resources
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- WCAG 2.2 SC: https://www.w3.org/TR/WCAG22/#error-prevention-legal-financial-data
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- Understanding: https://www.w3.org/WAI/WCAG22/Understanding/error-prevention-legal-financial-data.html
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- Quick reference: https://www.w3.org/WAI/WCAG22/quickref/?versions=2.2#error-prevention-legal-financial-data
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