"a:active"与"a:active"之间的区别和".active a.class" [英] Difference between "a:active" and ".active a.class"

问题描述

我在一个css文件中有一个

I have in a css file this:

#toolbar a.opener:hover,
#toolbar a.opener:active,
#toolbar a.opener:focus {
    something1;
}
#toolbar .active a.opener {
    something2;
}

问题:

1. 第一活动"和第二活动"之间有什么区别 活跃"?
2. 什么时候称为第一活动"和第二活动"?

1. What is the difference between the "first active" and the "second active"?
2. When are called the "first active" and the "second active"?

推荐答案

第一个规则包含伪"类，这些类在元素处于某种状态时将其定位. :active伪选择器在用户单击元素时适用于该元素.

The first rule incorporates "pseudo" classes, which target the element when it's in a certain state. The :active pseudo-selector applies to the element when the user is clicking on it.

后一个规则只是一个类选择器，它适用于具有"opener"类并且是具有"active"类的元素的后代的锚元素.

The latter rule is simply a class selector, which applies to an anchor element which has the class "opener" and is a descendand of an element which has the class "active".

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