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

December 11, 2014 Geof

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: (Level AA)

  • 1.Reversible: Submissions are reversible.
  • 2.Checked: Data entered by the user is checked for input errors and the
    user is provided an opportunity to correct them.
  • 3.Confirmed: A mechanism is available for reviewing, confirming, and correcting
    information before finalizing the submission.

Sufficient Techniques for 3.3.4 – Error Prevention (Legal, Financial, Data)

Situation A: If an application causes a legal transaction to occur, such as
making a purchase or submitting an income tax return:

  • 1.G164: Providing a stated period of time after submission of the form
    when the order can be updated or canceled by the user
  • 2.G98: Providing the ability for the user to review and correct answers
    before submitting
  • 3.G155: Providing a checkbox in addition to a submit button

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

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

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

  • 1.G98: Providing the ability for the user to review and correct answers
    before submitting
  • 2.G168: Requesting confirmation to continue with selected action

Advisory Techniques for 3.3.4 – Error Prevention (Legal, Financial, Data)

  • Informing the user what irreversible action is about to happen
  • SCR18: Providing client-side validation and alert
    (Scripting)
  • Placing focus in the field containing the error
  • Avoiding use of the same words or letter combinations to begin each
    item of a drop-down list
  • G199: Providing success feedback when data is submitted successfully

http://www.w3.org/TR/UNDERSTANDING-WCAG20/minimize-error-reversible.html

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