Force IE 11 “User agent string” using tags

Question

My website is broken in IE11.

We all know that HTML tags allow developer to force IE compatibility mode; in example

Answer 1

Solved! Website is up just installing Dotnet framework 4.5 on server

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Actually I didn't find a way to force programmatically browsers User agent string (this was the original question). But repaired website with 0 code..

Just made lot of tests and on one server I found out that website was working, on other server it wasn't.

The "good server" was a Win2012, and "bad servers" were Win2008. On Win2012 Aspnet 4.5 was running, and on Win2008 it wasn't.

I installed dotnet framework 4.5 on bad servers too, and everything started working!