The flex box model, aka Flexbox, will make designing layouts in CSS and HTML a lot easier once it hits mainstream. How close is it to being widely supported? It's actually not too bad, with global support at 88.88% as of 3/2/15. The main issue is with versions of Internet Explorer earlier than 10. Modern Chrome and Firefox, as well as mobile browsers almost all support Flexbox. Since this is a new tool that will likely be employed in CSS frameworks of the future, it's useful to know how and why it will happen. Here are a few good links.