BETA release
H_F06 Incorrect combined use of Hn and H tags for headings
PDF-F28, FAILUse case(s): Headings
Last updated on November 20, 2025
Description
This example demonstrates a failure condition in which the document contains both H tag(s) and Hn tag(s). In this case the document contains an H tag and an H1 tag.
In PDF/UA, two different mechanisms to tag headings are introduced: (1) the use of nested H tags (2) the use of numbered Hn tags according their outline level. You have to choose one mechanism. It is not allowed to mix both.
NOTE: Due to a lack of suitable tools, the H tag, while defined in PDF’s 1.7 specification, is impractical, and its use is not recommended.
Download(s)
These minimal examples are designed to express a single Technique. Effective use requires software that supports Tagged PDF.
Test(s)
Expected Results
Check #1 is false.
Procedures
- Check that either:
- only Hn tags are used, or
- only appropriately-nested H tags are used.
Application to WCAG 2.x
This Technique addresses the following WCAG 2.x Success Critieria:
Matterhorn Protocol
The Matterhorn Protocol 1.1 provides an algorithm for conformance with PDF/UA-1. Matterhorn checkpoint(s) (human or machine) relevant to this use-case:
01-006- 14-001
14-002- 14-007
Accessibility Technique Support Finder
Accessibility Technique Support Finders allows you to quickly locate software and services that claim to support a given Technique. Simply search the internet with a given technique’s finder together with the name of your product.
The technique finder for this Technique is: UA1_Tpdf-H_F06
NOTE: the “technique support finder” concept was introduced in January 2025; please allow time for adoption.
