{
  "schemaVersion": "crawler-atlas-1",
  "atlasVersion": "atlas-2026-07-28-v1",
  "canonical": "/atlas/heading-hierarchy",
  "title": "Heading hierarchy",
  "category": {
    "slug": "structure",
    "title": "Content structure for machines"
  },
  "definition": "A heading hierarchy divides a document into named sections with an explicit information structure.",
  "mechanism": "A clear h1 followed by nested section headings helps readers and machines associate claims, examples, and caveats with the correct topic.",
  "validation": "Extract headings in source order, flag unexplained level jumps, and confirm that headings describe sections rather than decorative fragments.",
  "commonFailure": "Choosing heading levels only for font size creates a misleading outline even when the rendered page looks correct.",
  "related": [
    "/atlas/semantic-html",
    "/atlas/tables"
  ],
  "modified": "2026-07-28"
}