HTML provides the structure, content and layout, CSS adds style and design, and JavaScript adds functionality and interactivity.

These three programming languages are tools that you can use to create, design and style your very own website.

Tony Patton focuses on CSS fundamentals and explains how multiple rules for the same element are handled. Multiple rules ensure that there will be no surprises for either you or the user community.

Learn how cascading style sheets (CSS) work, and how they can help you properly create HTML page layouts that conform to industry best practices.

jsFiddle lets developers play with the three core elements of Web development. Check out this powerful application for rapid prototyping and testing.