Success Criterion 3.3.1 - Level A
Error Identification
Ensure users receive a clear error message after entering incorrect data. Clearly indicate which entry is incorrect and why. It is important that error messages are also clear to users of assistive technologies. Therefore, also indicate errors in text to allow everyone to perceive them.
Impact
Filling in data correctly becomes easier for everyone when error messages are clearly indicated.
Clear error messages are especially important for people with cognitive, language and learning disabilities.
Check
"Are input errors indicated clearly when entering incorrect data?
This can be tested without assistive technologies.