What is the difference between HTML and CSS? HTML is a markup language that consists of tags enclosed in angle brackets. These tags tell the browser how to render the page's content.

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.

Chances are, if you've spent any time coding, you've come across CSS. But what is CSS, exactly? In short, CSS (Cascading Style Sheets) is a language that determines the style of a web document ...