13.9.7 Headlines in HTML export

Headlines are exported to ‘<h1>’, ‘<h2>’, etc. Each headline gets the ‘id’ attribute from ‘CUSTOM_ID’ property, or a unique generated value, see Internal Links.

When org-html-self-link-headlines is set to a non-nil value, the text of the headlines is also wrapped in ‘<a>’ tags. These tags have a ‘href’ attribute making the headlines link to themselves.