This time I will bring you the weights of pseudo-classes and pseudo-elements. What are the precautions for using the weights of pseudo-classes and pseudo-elements? The following is a practical case, let’s take a look.
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{ margin: 0; padding: 0;
} #a .b a{
color: yellow;
} .b a{
color: pink;
} a:hover{
color: red;
} /*
分析：
规则1：伪类(像:hover,:visited,:active,:link)的权重和类选择器是一样的
规则2：伪元素，像before,after优先级和标签选择器是一样的(这一条了解一下，和这道题无关)
#a .b a 的权重为：(0,1,1,1)
.b a的权重为：(0,0,1,1)
a:hover的权重为：(0,0,1,1)
结论：
#a .b a 的权重最高，所以，如果有这个样式的设置，页面上的a链接是黄色的，鼠标hover上去也是黄色的
如果把#a .b a去掉，.b a的权重和a:hover的权重一致，那他们就看谁在最后面，在最后面写的会层叠掉前面的
*/
</style></head><body>
<div class="a" id="a">
<div class="b"><a href="#">我是链接</a></div>
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