(Wed Apr 10 2019 00:00:00 GMT+0300 (Eastern European Summer Time)) The Bootstrap dropdown component is very easy to use, but doesn't work so well when it must contain a lot of content. In my case the dropdown contained the Table of Contents for a book with lots of ToC entries, and it didn't even fit well on a large screen. On a small screen for a mobile device, it shrank into unusableness, and Google recently lodged a usability complaint against the site. After researching a ton of alternative designs, a simple solution appeared.