WCAG 3.3.6: Error Prevention (All)
WCAG 3.3.6 Error Prevention (All) is a level AAA success criterion from WCAG 2.0. For all form submissions, people can reverse, check or confirm.
Even a contact form can be sent by mistake.
How to test
Submit a form. You should be able to review or undo.
How to fix
Add a confirmation step or a way to edit after sending.
Example that fails
The contact form sends on the first click with no review.
Example that passes the check
A confirmation step shows the message before it is sent.
Shopify
Add a confirm step on custom quote forms.
WooCommerce
Confirm before account deletion.
WordPress
Add a review step on long forms.
Wix
Enable a confirmation state that shows the entries.