Headings in the context of web accessibility are elements of html which allow a screen reader to orient the user to her location on the page. Headings are numbered, which allows the screenreader to locate them sequentially from top to bottom.
In Libguides, headings 1 and 2 are included in the html behind the page by default to identify parts of the page for assistive devices. However we as Libguide creators have the option of including subsequent headings. For instance the tag for the box title "Headings" above is included automatically. However if you create a heading within a bx, you would need to add a heading tag to it. H1 and H2 are used by the page settings, so the first manually added H tag would be H3.
Include these if you have a large font title within a box, which is followed by content. The screenshot shows where to find the heading tags.
If you are editing in html, you can use the “source” button to add heading tags to any piece of text. Do not use headings 1 and 2, and keep track of your heading sequence on the page.