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.
Required No for HTML4 Legacy Techniques ruleset mapping
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