MindBEMding – getting your head ’round BEM syntax
One of the questions I get asked most frequently is what do – and __ mean in your classes? The answer is thanks to BEM and Nicolas Gallagher...
The online whiteboard of Kristofer Palmvik
By using substring selectors, we can target and then visualise the general makeup of a page based on the types of class it contains
You can chain a selector with itself to increase its specificity. That is to say: .btn.btn { } will select based on only one class (.btn) but with double the specificity.