One of the easiest ways to get started with CSS is to understand the core selectors, child selectors and descendant selectors. With these three concepts, you can move a lot of styling to CSS and out ...

Use this handy, simplified guide to quickly learn HTML and CSS -- a foundation of modern web development.

The group recently published the Last Call Working Draft of "Selectors API," which are widely used in CSS, and are patterns that match against elements in a tree structure.