Examples of using css pseudo-classes and pseudo-elements
The pseudo-class in css is often used to set the status of a tag, and the pseudo-element sets the style of the tag.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>css伪类-标签的状态;伪元素</title>
<!-- 伪类 可以 被 标签，id，class 指定使用-->
<style>
/*伪类将应用于未被访问过的链接，与:visited互斥。*/
:link {
color: red;
}
/*伪类将应用于有鼠标指针悬停于其上的元素。*/
a:visited {
color: green;
}
/*伪类将应用于被激活的元素，如被点击的链接、被按下的按钮等。*/
a:hover {
color: blue;
}
/*伪类将应用于被激活的元素，如被点击的链接、被按下的按钮等。*/
a:active {
color: orange;
}
.inputName:focus {
background-color: orange;
}
/*伪元素 第一行*/
:first-line {
}
/*伪元素 第一个字符*/
:first-letter {
}
/*伪元素 第一个 子元素（第一个子元素是子元素的span标签*/
span:first-child {
font-size: 19px;
color: brown;
}
/*伪元素 after before,指定 位置 插入 内容 content*/
.div1:after {
/*after,before特有 属性*/
content: "-------";
}
</style>
</head>
<body>
<a href="#">当前网页</a>
<a href="http://www.baidu.com">百度一下</a>
<a href="http://itcast.cn">传智播客官网</a>
<a href="http://www.163.com">网易</a>
<a href="http://www.sina.com">新浪</a>
<br>
<input type="text" class="inputName" value="123">
<hr>
<div>
<span>111</span>
<span>222</span>
<span>333</span>
</div>
<div class="div1">
<span>111</span>
<span>222</span>
<span>333</span>
</div>
</body>
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