CSS, or Cascading Style Sheets, defines the look and formatting of that HTML. Both are essential to coding your own website, and here's how to get acquainted with them.

Make sure you validate your HTML and CSS, using a service like the W3C’s validator. This will warn you about obsolete tags and other errors that may make your HTML less robust.

Twitter has just released Bootstrap, a new toolkit to build web apps using CSS. It includes base CSS styles for typography, forms, buttons, tables, grids, navigation, alerts, and more. You can ...

KaiOS also uses web technologies such as HTML, CSS, and JavaScript, and all of the available apps are written in these languages too.