All WCAG criteria
WCAG 3.3.3 · UnderstandableLevel AA

3.3.3Error Suggestion

When a user input error is detected and suggestions are known, the suggestions must be provided to the user.

Common failures

Patterns that fail this criterion.

  • 01"Invalid date" — without telling the user the expected format
  • 02Password validation rejecting input without saying what is missing
How to test

Testing approach: manual.

Manual — submit invalid data; confirm suggestions are provided when possible.

How to fix

Remediation steps.

  1. 1

    Explain the rule

    "Date must be in MM/DD/YYYY format" not just "Invalid date".

  2. 2

    List password requirements

    "Password must be at least 8 characters, include 1 number and 1 special character."

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Related criteria

Often appears with…

WCAG 3.3.1 · Level A

Error Identification

All 50 WCAG 2.1 Level A + AA success criteria explained.

View the full checklist