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Text boxes, sidebars, and asides are all what are considered secondary content
.
All secondary content
should be moved to an appropriate place within the main narrative flow (i.e. at the end of a paragraph or section.)
Aside:
to all secondary content headings. This will indicate to the reader they are reading secondary content.
<note>If the secondary content does not have a heading insert the heading Aside
with the appropriated heading level</note>
Example
Aside: Text Box Heading [heading style]
This is an example of content text. [normal]
or
Aside [heading style]
This is an example of content text.[normal]
<note>There is a section in About this digital talking book that addresses secondary content.</note>