IE - no longer possible to remove box outline?

the usual way to remove the IE link outline no longer seems to work for me - I'm using IE9 which doesn't h开发者_Python百科ave the outline, but when I switch back to 7 or 8 (using IE9's dev tools) the outline is there. My CSS is below - anyone any ideas?

a:active, a:selected { 
    border: none;
    outline: none;
}

Please download a proper virtual machine environment that contains old versions of Internet Explorer. It could be that the compatibility mode does not render your HTML the way it should. The best way to test IE is to actually use IE in a clean environment. You can download the App Compat VHDs here:

http://www.microsoft.com/download/en/details.aspx?id=11575

Please download a proper emulater for old versions of Internet explorer. It could be that the compatibility mode does not render your code the way it should. The best emulator is The IE Tester, you can download a copy from here..

http://www.my-debugbar.com/wiki/IETester/HomePage