How to avoid ie8 compatibility button?

Question

In IE8, the Microsoft introduced a new mode called compatibility mode which would render the page like IE7.

You can see this button next to address bar in stackoverf

Answer 1

Short answer:

Put this in your head tag to tell the browser that your page works in IE 8:

Also as per Jon Hadleys comment, to ensure the latest (not just IE8) rendering engine is used, you could use the following: