Techniques for Accessible PDF: Headings
Headings are vital in organizing document content, especially with longer or complex documents. For assistive technology, the correct use of headings allows what would otherwise be an undifferentiated stream of text to become a navigable document in which readers can quickly find the content they want to read, and skip the content they don’t want to read.
Getting headings right is especially important with PDF documents, which can be very long, and may include deeply nested headings. PDF files can also contain multiple documents and / or subsections of other documents. Accessibility techniques for headings may therefore differ from techniques that are applicable to other technologies such as HTML.
These 9 new techniques and 8 failure examples provide formalized representations of the correct and incorrect expression of headings in PDF files conforming to PDF/UA-1, the ISO standard for accessible PDF 1.7 files.
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