3.3.3 Error Suggestion
Conformance level: AA
Criterion released in WCAG version: 2.0
TL;DR: When users make an error, provide suggestions for fixing it when possible. Good suggestions reduce frustration and task abandonment.
Official description of the success criterion
If an input error is automatically detected and suggestions for correction are known, then the suggestions are provided to the user, unless it would jeopardize the security or purpose of the content.
What to do?
Provide suggestions for correcting input errors.
Why is it important?
Assists users in completing forms and inputs without errors.
Common pitfalls
Not providing known suggestions for correcting errors. Remember to check these also with a screen reader! In many cases, a suggestion might be shown to a sighted user.
How to test for it?
Fill in forms with test content - if you expect some type of content to fail, use that type of content to check for errors.