Definition When input error is automatically detected and suggestions are automatically known, the suggestions must be provided to the user (some exceptions).
Purpose
  • Users benefit from being informed of invalid input and on how to correct invalid input.
Mappings
  • HTML4 Legacy Techniques (Recommended)
  • HTML5 and ARIA Techniques (Required)
WCAG 2.0 Success Criteria

3.3.3 Error Suggestion (Level AA, Primary Success Criterion)

Rule Category Forms
Scope Element
Target Resources textarea and input[type="text"] elements, and ARIA textbox, gridcell and combobox widgets
  • select
  • textarea
Techniques
  • Add aria-describedby reference on the form control or widget to the suggestion information.
  • Use a popup list to provide suggested values for valid input.
Informational Links