说明：  手册提供了完整的 CSS2.0 的属性(Properties)、规则(At-Rules)、伪类(Pseudo-Classes)、伪元素(Pseudo-Elements)、声明(Declarations)、单位(Units)、选择符(Selectors)的介绍。其内容涵括了 W3C 的 CSS2.0 标准，以及 Internet Explorer 和 Netscape 各自的私有内容。出于种种众所周知的原因考虑，本手册以浏览器的事实标准
(Manual provides a complete CSS2.0 properties (Properties), rules (At-Rules), pseudo-classes (Pseudo-Classes), pseudo-elements (Pseudo-Elements), Statement (Declarations) units (Units), select the character (Selectors) Introduction. The content covers the W3C CSS2.0 standards, as well as Internet Explorer and Netscape private content. For various well-known reasons to consider this manual is the fact that the standard browser)