Heading Order must start with H1

Rule ID: heading-order-first
Ruleset: axe-pdf 2.0
User Impact: Serious
Guidelines: PDF/UA

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Compliance Data & Impact

User Impact


Disabilities Affected

  • Blind
  • Deafblind
  • Mobility


  • PDF/UA

    How to Fix the Problem

    Start with an H1 tag for the main heading of your document. Then tag the remaining headings in a sequential order.

    Why it Matters

    When heading elements are applied correctly, the page becomes much easier to navigate for screen reader users and sighted users alike. In the same way that sighted users can glance at a page and get a sense of its contents, users of screen readers can do the same by navigating through headings. Properly tagged headings can save users, especially those who use screen readers, a lot of time and frustration.

    Rule Description

    Headings are tagged in an outline format starting with Heading Level 1 for the main title of the document and followed by subsequent heading levels.

    The Algorithm (in simple terms)

    Tag the main heading of your document as an H1.


    Refer to the complete list of axe 2.0 rules.

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