Headings are usually indicated by increasing the font size, font weight, or the space around the title, but these visual differences may not be apparent to a person using Assistive Technologies. When the document is ‘strongly structured’ (the document uses grouping elements such as ‘Art’, ‘Sect’, and ‘Div’ to represent the organization of the material) and the heading is always and only the first child of the grouping element, then use ‘H’ on the FO for the heading. When the document is not strongly structured, use the ‘H1’ to ‘H6’ Structure Elements to indicate heading levels.

When generating PDF/UA: