Built using a specially styled inline unordered list; 
<ul>
   <li> ... </li>
</ul>

NOTES:
 - each "collection" is its own unordered list <ul> ... </ul> ;
 - each "collection" becomes visible when site visitor clicks one of the tab pills;
 

Top of WYSIWYG-HTML editor has styles to change shape of image corners. Styles require an area ID.

Built using built-in bootstrap version; see:   https://uh.edu/marcom/resources/bootstrap/components/nav/