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What You Should Already Know Before you continue you should have a basic understanding of the following: HTML / XHTML If you want to study these subjects first, find the tutorials on our Language page . What is CSS? CSS stands for C ascading S tyle S heets Styles define how to display HTML elements Styles were added to HTML 4.0 to solve a problem External Style Sheets can save a lot of work External Style Sheets are stored in CSS files Styles Solved a Big Problem HTML was never intended to contain tags for formatting a document. HTML was intended to define the content of a document, like: <h1>This is a heading</h1> <p>This is a paragraph.</p> When tags like <font>, and color attributes were added to the HTML 3.2 specification, it started a nightmare for web developers. Development of large web sites, where fonts and color information were added to every single page, became a long and expensive process. To solve this probl...