UMD/Standalone doesn’t works with IE11 even using basic layout

Problem
I’m trying to use basic layout with UMD, but it works fine just for modern browsers, IE11 doesn’t works. I’m using the polyfill to IE. The layout breaks on IE11, the menu doesn’t work. Some basic components like button are not displayed.

There is an example at: https://codepen.io/gtmnet/pen/QWbGgzZ

To Reproduce
Steps to reproduce the behavior:

1. Save the code: https://codepen.io/gtmnet/pen/QWbGgzZ in a file like teste.html and try to open in a modern browser, and you will see that works fine.
2. Try the same with IE11, and it will not work

Platform
OS: Windows 10 Version: 1903
Browsers: IE 11.657.18362.0, Chrome 80.0.3987.106, Firefox 73.0.1

Is it a bug?