Prevent errors

Definition To prevent errors when input includes legal and/or financial transactions (e.g. online shopping, banking), the user must be able to either reverse, check or confirm the data before the transaction is finalized.
Purpose
  • The intent of this rule is to help users with disabilities avoid serious consequences as the result of a mistake when performing an action that cannot be reversed. For example, purchasing non-refundable airline tickets or submitting an order to purchase stock in a brokerage account are financial transactions with serious consequences.
Required Yes for HTML4 Legacy Techniques ruleset mapping
WCAG 2.0 Success Criteria

3.3.4 Error Prevention (Legal, Financial, Data) (Level AA, Primary Success Criterion)

Rule Category Forms
Scope Page
Target Resources Forms that contain legal or financial transactions including online purchases
  • select
  • textarea
Techniques
  • Provide a confirmation page showing all the user inputs before for final submission of the information for modification of user controlled data on a server.
  • Provide a means for the user to review previous submissions and give them the ability to cancel or modify previous submissions of legal or financial information.
  • Use a confirmation checkbox in addition to the submit button, to require the user to confirm the data is valid before submission.
Informational Links