January 2010
Intermediate to advanced
791 pages
14h 17m
English
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Chapter 25. CSS Basics
IN THIS CHAPTER
The Purpose of Styles
Styles and HTML
CSS Levels 1, 2, and 3
Defining Styles
Cascading Styles
The Web was founded on HTML and plain-text documents. Over the last few years the Web has become a household and industrial mainstay, maturing into a viable publishing platform thanks in no small part to Cascading Style Sheets (CSS).
CSS enables Web authors and programmers to finely tune elements for publishing both online and across several different types of media, including print format. This chapter serves as the introduction to CSS. Subsequent chapters in this section will show you how to use styles with specific elements.
The Purpose of Styles
Styles are an electronic publishing invention for dynamically coding text and other document elements with formatting. For example, a style called "Heading" would be attached to every heading in the document. The style definition would contain information about how headings should be formatted. In this book, for example, headings (such as "The Purpose of Styles," above) use a larger, bold font.
Note
Anyone who has spent an appreciable amount of time in and around a word-processing program has no doubt encountered styles. The concept of styles used by word processors does not differ appreciably from that of CSS and the Web—if you understand the former, you should have a good grasp on usage of the latter.
The advantage of styles is that you can change a definition once and that change affects every element using that ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.