JavaScript Browser Check: Is Browser still up to date?

In general, here you can find some information about how to check for a browser version and browser name. So, you can just check for another version depending on the browser in order to show a notification, for example in form of a DIV box that is invisible otherwise.

However, there is one question: Do you really want to force the user to always use the absolute current version of each browser? Or wouldn't it be better to just ensure something like a minimum required browser version? For example, if your scripts are running in all Internet Explorer browsers since Internet Explorer 8, I would just check for the browser version 8 and before and not whether someone is using 9, 10 or 11, because that is making the difference.

This question is also important because otherwise you have to update your script whenever a new browser version comes out and just consider the Firefox update cycle and the work that would make.
2016-01-18 at 18:57