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WCAG 2.1

3.3.4 Error Prevention (Legal, Financial, Data)

Level AA success criterion

For web pages that cause legal commitments or financial transactions, that modify or delete user-controllable data, or that submit test responses, at least one of the following is true: submissions are reversible, data is checked for errors and the user can correct them, or a mechanism is available to review, confirm, and correct before finalizing.

Why it matters

Accidental submissions of financial, legal, or data-deletion actions can have serious consequences. Users with disabilities are more prone to input errors and need safeguards.

Common violations

  • One-click purchases with no confirmation step
  • Account deletion without confirmation dialog
  • Financial transfers with no review page
  • Legal agreements submitted without summary review

Code examples

Bad

<button onclick="processPayment()">Pay $500</button>
<!-- Immediate payment with no review or confirmation -->

Good

<h2>Review Your Order</h2>
<p>Total: $500</p>
<p>Shipping to: 123 Main St</p>
<button onclick="showConfirm()">Confirm and Pay</button>
<button onclick="editOrder()">Edit Order</button>

How to fix

Add confirmation steps before irreversible actions. Provide a review page for financial and legal submissions. Allow users to undo or reverse actions within a reasonable timeframe. Validate data and present errors before final submission.

Related criteria

3.3.1 Error Identification3.3.3 Error Suggestion3.3.2 Labels or Instructions

Related resources

WordPress accessibility guideShopify accessibility guideSquarespace accessibility guide

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