One of the main tools for structuring documents is the use of headings. On a visual level, headlines are usually marked with a larger font size or a bolder font style.
For Accessibility the headings are additionally marked with
<H6> Tags in the PDF format. The numbers in those heading tags reflect a hierarchy from the highest level
<H1> to the lowest level
<H6>. This hierarchy allows content parts to be nested and assigned to each other.
The assignment of these tags gives the header texts a semantic meaning on a technical level. Thus, AT automatically recognises which heading / heading level it is.
In addition, users get another possibility to navigate through a document. 67.5% of screenreader users have stated, according to a WebAIM survey, that headings are their most important tool for finding content.
The heading tags can already be assigned using the authoring software. See also: