Web browsing anchored the habit of associating underlined content with links. Underlining content that is not a link risks triggering unnecessary clicks and user frustration. Be careful, this does not require you to emphasize your links.
Objectives
Prevent unnecessary clicks on underlined text mistaken for hyperlinks.
Facilitate the identification of links.
Implementation
Do not use underscore for simple texts or elements that do not constitute links.
Control
In each file containing underlined content :
Identify underlined texts in ebook;
Controlling the nature of these contents to verify whether they are actually hyperlinks.