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WCAG success criterion · Understandable

3.3.6 Error Prevention (All)

Guideline 3.3 Input Assistance. Level AAA, part of WCAG 2.0 and every later version.

ADA compliance guide

What this criterion requires

The reversible/checked/confirmed requirement of 3.3.4 applies to all user submissions, not only legal and financial ones.

Who it helps

Everyone, at the strictest tier.

Example: fails vs passes

Fails
A contact form that submits irreversibly with no review, at AAA.
Passes
Review-before-send or an undo window on every submission.

AAA extends 3.3.4 to all submissions, not just legal/financial ones.

How to meet and fix it

Common failures auditors find

Automated scanning catches a share of these instantly - run a free check - and a manual audit covers the judgement calls a tool cannot make.

Sources

Last updated . Reviewed by the EqualWeb accessibility team.

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