Style rule contains colon without pseudo class.
样式规则包含冒号而不包含伪类。
Using pseudo class selectors to change content?
使用伪类选择器来改变内容？
You can add a pressed button state with CSS by styling the active pseudo-class of the link in question.
你可以通过配置CSS中链接的active伪类来添加一个按下的按钮状态。
Objective To find the dentoskeletal characteristics of pseudo Class III malocclusion in mixed dentition.
目的研究替牙期假性安氏III类错的牙颌特征，为早期诊断提供依据。
A pseudo-class always consists of a "colon" (:) followed by the name of the pseudo-class and optionally by a value between parentheses.
开头，冒号后面是伪类的名称和包含在圆括号中的可选参数。
A pseudo-class always consists of a "colon" (:) followed by the name of the pseudo-class and optionally by a value between parentheses.
开头，冒号后面是伪类的名称和包含在圆括号中的可选参数。
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