How to set IE document mode?

Question

In IE9 my browser has set:

F10 -> tools -> compatibility views setting -> added 192.168.10.227

therefore when I try to serve file, the browser mode is 9 compat v

Answer 1

But according to IE DEv Center ,

In addition, do not use an "X-UA-Compatible" meta tag on the page or send a custom HTTP header from the web server.

To force a webpage you are viewing in Internet Explorer 10 into a particular document compatibility mode, first open F12 Tools by pressing the F12 key. Then, on the Browser Mode menu, click Internet Explorer 10, and on the Document Mode menu, click Standards.