Submitted by michael on Thu, 01/01/2015 - 16:03 URL http://lesscss.org/ Less extends CSS with dynamic behavior such as variables, mixins, operations and functions. Less runs on both the server-side (with Node.js and Rhino) or client-side (modern browsers only). Tags Less extends CSS with dynamic behavior such as variables mixins operations and functions. Less runs on both the server-side (with Node.js and Rhino) or client-side (modern browsers only).