The CSS Working Group has published CSS Cascading and Inheritance Level 3 as a W3C Recommendation. This CSS module describes how to collate style rules and assign values to all properties on all elements. By way of cascading and inheritance, values are propagated for all properties on all elements.
CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, etc.
Original source: https://www.w3.org/blog/news/archives/8921