CSS Overview

Rational for using CSS

Cascade Style Sheet (CSS) is designed to remove style from the HTML documents, and store them separately for portability and reusability.

A CSS rule contains at least one selector and at least one declaration within a declaration block.

• Each selector is separated by a comma (,), and a space used to cascade specificity.
• A declaration is made up by name/value pair, and each declaration is separated by a semicolon (;)
• A declaration block is defined by curly braces ({}).

There are three types of style sheets.

• Browser -- Browser default style sheet for defining non-declared styles.
• User -- User's style sheet for accessiblity reason.
• Author -- Designer's style sheet.