What's new in CSS Selectors 4 | grack
"CSS Selectors Level 4 is the next iteration of the CSS selector spec, the last version of which was made a recommendation in 2011 after being a working draft for a number of years. So, what’s new?"
BEM and SMACSS: Advice From Developers Who've Been There
"After going through everyone’s responses and ideas, it was clear that the best approach seemed to be a hybrid."
Atomic Design E-book by Brad Frost
"It covers why thinking about interfaces as systems is so important, introduces atomic design as a sound methodology for creating design systems, and details tools and processes for making and maintaining style guides."
Interactive WCAG | Viget
"The entire document can be filtered to view the rules for a specific level of conformance (A, AA or AAA). Additionally, each rule has been tagged from a list of typical areas of specialty that might be affected (such as FED, UX, or Content)."
"Solve WCAG 2.0 & Section 508 issues before they happen with our robust, flexible, and easy API"