3.3.4: Error Prevention (Legal, Financial, Data) [AA]

Description Sufficient Techniques Advisory Techniques Failures Notes

Description

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.

Sufficient Techniques

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

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

Advisory Techniques

Advisory Techniques for Success Criterion 3.3.4

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

Failures

Failures for Success Criterion 3.3.8

• F109: Failure of Success Criterion 3.3.8 and 3.3.9 due to preventing password or code re-entry in the same format

Notes