Definition Every input type image element must have an alt or title attribute with content.
Purpose
  • Alternate content associated with an image-based form control ensures that information about the control is spoken by screen readers when it receives focus.
Mappings
  • HTML4 Legacy Techniques (Recommended)
  • HTML5 and ARIA Techniques (Required)
WCAG 2.0 Success Criteria

3.3.2 Labels or Instructions (Level A, Primary Success Criterion)

Rule Category Forms
Scope Element
Target Resources input[type="image"] elements
Techniques
  • The alt attribute is the preferred and most commonly used way to provide an accessible label for input type image elements.
  • In special cases, the title attribute can be used on the input type image element to provide an explicit text description of its purpose.
  • In special cases, the aria-labelledby attribute can be used on the form control element to reference the id(s) of the elements on the page that describe its purpose.
  • In special cases, the aria-label attribute can be used on the form control element to provide an explicit text description of its purpose.
Informational Links