Bootstrap v5 will drop requirement for jQuery, drop IE10 and maybe drop IE11 support
The Bootstrap is working on the Bootstrap v5 release, and the team recently committed changes to drop support for at least IE10 (and possibly IE11). Judging by pull requests, their plan to drop the requirement to use jQuery has been a long time coming. On the one hand it is heart-warming to see Internet Explorer finally be dropped from support, and on the other hand we recognize the necessity of letting go of tools that have outlived their usefulness. Finally we'll note that the predicted release date for Bootstrap v5 is "late spring 2020".
How to build scrollable dropdown menu in Bootstrap v4 when it must hold dozens of choices
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.