Steps to reproduce:
1. Open https://www.libreoffice.org/get-help/bug/ in IE11.
Does not fail.
Operating System: Windows 8
Version: 126.96.36.199.alpha0+ Master
confirming with WIN8.1 64-bit German and IE11
I should add additional information after a chat with Liongold:
* Problem is that the method "attacEvent" was dropped in IE11. This method is caled by JQuery.
* Problem might already fixed in a new JQuery version
* Compatibility Mode in IE11 help either. Layout is looking ugly and method "reduce" is also not supported
Liongold will try to update JQuery later (hoping that this solves the issue)
Liongold fixed the bug by updating to JQuery 1.11 :-)
verified that it works again.