Using Cascading Style Sheets - Using Cascading Style Sheets
Cascading Style Sheets (CSS) provide a simple mechanism for adding style (e.g. fonts, colors, spacing) to web documents. This section describes how to use cascading style sheets with the generated web pages.
One of the fundamental features of CSS is that style sheets cascade: more than one style sheet can influence the presentation of a document. Cascading is a fundamental feature of CSS, because any single document could very well end up with style sheets from multiple sources: the browser, the HTML author, the designer, and possibly the user.
Each web browser has a default style sheet that presents documents in a reasonable manner. HTML authors can attach a preferred style sheet, while the reader may have a personal style sheet. HTML authors need to write style sheets only if they want to suggest a specific style for their documents.
All information about Cascading Style Sheet technology that is NOT in this section or its sub-sections, can be found in the Cascading Style Sheet specification of the World Wide Web Consortium (W3C):