This is a good article. It presents a provocative idea, exploring the use of CSS in clever and not obvious ways. It's sort of but not really "hackish" because

This is a good article. It presents a provocative idea, exploring the use of CSS in clever and not obvious ways. It's sort of but not really "hackish" because he uses perfectly legitimate, if relatively obscure features of CSS, things we ought to know but haven't studied enough. The result is an elegant approach to responsive design. Templates and other tools no doubt use such approaches under the hood. A few lines of CSS doing the job without having to drag along the bloat of a framework is a very good result. Having the knowledge to directly apply CSS to achieve design goals is enormously powerful and worth learning about.