• 1. Pseudo-classes: 伪类 | 拟类别 | 貌似类
• 2. Structural Pseudo-Classes: 结构伪类 | 强大的结构性伪类
• 3. Pseudo-classes Selectors: 伪类选择符 | 以区别伪类选择符

更多释义

• 1.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。
  dict.yoduao.com
• 2.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。
  dict.yoduao.com
• 3.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。
  dict.yoduao.com

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