Pseudo-classes 伪类 ; 拟类别 ; 貌似类
Structural Pseudo-Classes 结构伪类 ; 强大的结构性伪类
Pseudo-classes Selectors 伪类选择符 ; 以区别伪类选择符
CSS Pseudo-Classes Reference 伪类选择符 ; 伪类
Pseudo Classes selectors 第四部分伪类选择符
Pseudo-Classes and Other Properties 伪类和其他属性
Link pseudo-classes 链接伪类
Designated by a colon preceding the name, pseudo-classes are independent of particular elements and instead look at what's happening within the document.
伪类的表示方法是在名称前面加一个冒号。伪类与特定元素无关，而是根据文档中发生的情况应用样式。
A simple selector is either a type selector or universal selector followed immediately by zero or more attribute selectors, ID selectors, or pseudo-classes, in any order.
一个简单选择符或者是一个类型选择符，或者是一个全局选择符，紧跟在后的是零个或多个属性选择符，ID选择符或伪类，次序任意。
Pseudo-elements are similar to pseudo-classes (and share syntax with them) but define content within the document. Pseudo-elements defined by the CSS2 Recommendation include
伪元素与伪类相似（语法也相同），但它定义的是文档中的内容。
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