WebAIM: Headings (opens in new tab)

When a user encounters a webpage, they want to confirm that the page includes relevant information and find that information quickly. Headings create an outline for the page, similar to a term paper outline or table of contents. While sighted users typically determine a page's content and structure by scanning for large text that look likes headings, screen reader users rely on the page's underlying semantic structure for navigation. Users with motor or other disabilities might also navigate ...