[csswg-drafts] css new standard idea

annopnod has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== css new standard idea ==
css new standard idea
**code**
<style>
            #Data{
                width: 100px;
            }
            #Topic{
                width: #Data.width;// #Topic width= 100px;
            }
            #Topic2{
                width: #Data.width + 100px;// #Topic width= 200px;
            }

        </style>

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/759 using your GitHub 
account