I am wondering how do you stop people who are using IE 8 from going to Compatibility mode?
<meta http-equiv="X-UA-Compatible" content="IE=8" />
I found this tag and I think this forces people to stay in IE-8 mode but I am not too sure and can't check as I have IE 9.
If people are in IE 9 mode I force them to not go into IE 8 or IE 7 Compatibility mode?
I tried to put the above line in my code and went to IE 9 -> Tools -> Compatibility View(Grayed Out)
but "Compatibility View Settings" was not grayed out and it seems you could add the site through there.
So should that not disable?
<meta http-equiv="X-UA-Compatible" content="IE=8" />
should force your page to render in IE8 standards. The user may add the site to compatibility list but this tag will take precedence.
A quick way to check would be to load the page and type the following the address bar :
javascript:alert(navigator.userAgent)
If you see IE7 in the string, it is loading in compatibility mode, otherwise not.