IE 11 : supported ?

[jdauphant]

Is IE 11 supported ? (I have half my user on it)

I see lot of variables and switch isn't working on IE.

[SebastienTouze]

IE 11 does not support the var() nor the calc() (a least not properly) nor @media queries (only on Windows 10). So there is a lot to change for browser which have only security updates now.
Maybe you can find polyfills to make a version for IE11 ?

Issues with switches may be fixed with #146