Cascading Style Sheets (CSS)
CSS is what makes a web page look the way it does. It controls all the presentation, style, colors, and positioning of the content and (X)HTML.
(X)HTML is a structural markup language, by itself it was never meant to show presentation; only describe content like paragraphs, headers, page divisions, etc. However, HTML has been exploited and misused in recent years by providing presentational and style information; doing this decreases accessibility and hinders the end user from having a rich experience on the web by load time and reducing performance.
Using external CSS keeps your (X)HTML clean, separates your presentation from your content, increases accessibility, improves performance, allows for easy enhancements such as Ajax, and keeps code readable and maintainable.
Sample CSS Code
p {
font-size:.8em;
color:#222;
padding:.5em;
margin:.5em 0;
}
