Review: 3.3.4 Error Prevention (Legal, Financial, Data) (AA)

[qbalsdon]

Task: Edit MCAG section 3.3.4 considering the mobile research questions (to be completed)

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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:

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.

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Sufficient Techniques for Success Criterion 3.3.4

Note: Other techniques may also be sufficient if they meet the success criterion. See Understanding Techniques.
Situation A: If an application causes a legal transaction to occur, such as making a purchase or submitting an income tax return:

G164: Providing a stated time within which an online request (or transaction) may be amended or canceled by the user after making the request
G98: Providing the ability for the user to review and correct answers before submitting
[G155: Providing a checkbox in addition to a submit button ](https://www.w3.org/WAI/WCAG22/Techniques/general/G155.html)

Situation B: If an action causes information to be deleted:

G99: Providing the ability to recover deleted information
G168: Requesting confirmation to continue with selected action
G155: Providing a checkbox in addition to a submit button 

Situation C: If the Web page includes a testing application:

G98: Providing the ability for the user to review and correct answers before submitting
[G168: Requesting confirmation to continue with selected action ](https://www.w3.org/WAI/WCAG22/Techniques/general/G168.html)

Advisory Techniques for Success Criterion 3.3.4

SCR18: Providing client-side validation and alert
G199: Providing success feedback when data is submitted successfully