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Chapter 17. Styles > Cascading Style Sheets

Cascading Style Sheets

Cascading Style Sheets (CSS) is a Web technology that extends HTML’s formatting options and centralizes style specifications. You are no longer limited to font sizes ranging from 1 to 7 or background colors applied to simply the page and table elements. More importantly, CSS provides a means for formatting the text of a site in a central location. Changes to the page’s formatting can then be made in one location, and all changes automatically update across all pages linked to that style.

For example, using CSS, you can specify that all text nested within a Header 1 (an <H1> tag) should render orange, a particular font size, and italic. Any text nested within an <H1> tag linked to that style definition would render as such. If you decide to change the style of Header 1, you need only change the code in one place, the style definition. All pages linked to that style definition would then update.


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