W3C Decisions on CSS Variables (Accepting Comments)

Coming from LESS this seemed strange at first, but upon reflection it makes a ton of sense, and provides for fantastic flexibility.

Now to really make this useful, we just need mathematical operators for distance values (12px - 2px) and functions like darken() and lighten() on color values... or is that being proposed somewhere too?

    :root{
        var-myforecolor: red;
        var-mybackcolor: blue;  
    }

    h1{
        color: $myforecolor;
        background: $mybackcolor;
    }

Bring it on!

Then, if browser makers didn't implement appearances the same way, we could point to the standard and ask why.