Editor’s note: This How To assumes a basic understanding of HTML. Along with HTML and JavaScript, CSS forms the foundation of the open Web. These three technologies power just about every website, and ...

Understanding how browsers parse CSS and render websites is an important first step towards writing more efficient code. In this first piece on efficient CSS, we look at selectors, how the browser ...

CSS rules are defined for HTML selectors; for classes, which are references in tags that make the tags part of a group that can be collectively modified; and for IDs, which are like tags but are ...

In the past we’ve covered ways Web designers can keep their CSS clean, highlighting ProCSSor, a desktop app for the Mac which cleans up and compresses your code; as well as CSS Compressor; Code ...