Sibling headings must be unique

Rule ID Heading 3
Definition The accessible names of sibling heading elements of the same level must be unique.
  • If section headings that share the same parent heading are NOT unique, users of assistive technologies will not be able to discern the differences among sibling sections of the web page.
  • HTML4 Legacy Techniques (Recommended)
  • HTML5 and ARIA Techniques (Recommended)
WCAG Success Criteria

2.4.6 Headings and Labels (Level AA, Primary Success Criterion)

Rule Category Headings
Scope Element
Target Resources Heading elements
  • h1
  • h2
  • h3
  • h4
  • h5
  • h6
  • Make sure the accessible names of sibling headings that share the same parent heading help users understand the unique content of each section they describe.
Informational Links