In this article, Stephen Shaw introduces a technique for perfect horizontal and vertical centering in CSS, at any width or height. The techniques works with percentage-based width/height, min-/max- width, images, position: fixed and even variable content heights.
Rachel Andrew has been digging around in the CSS Fragmentation spec, and finding browser support is somewhat fragmented. In this article, she explains what fragmentation is, why you might want to use it, and what the state of browser support is.
CSS styles isolation is the most frequent start point of the BEM usage. But this is the least that BEM can give you. BEM brings a system approach in your project and keeps it from the mess.Inna Belaya