Text boxes, sidebars, and asides are all what are considered
secondary content should be moved to an appropriate place within the main narrative flow (i.e. at the end of a section.)
The appropriate heading level is to be applied to the heading of the secondary content. For more information, please see the Headings Section.
You will need to add the term
Aside: to all secondary content headings. This will indicate to the reader they are reading secondary content.
Asidewith the appropriate heading level
Aside: Text Box Heading [heading style]
This is an example of content text. [normal]
Aside [heading style]
This is an example of content text.[normal]