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In CSS, the content attribute is used in conjunction with the ":before" and ":after" pseudo-elements to insert content. The syntax is "content: normal|none|counter|attr|string|open-quote |close-quote|no-open-quote|no-close-quote|url|initial|inherit;".
The operating environment of this tutorial: Windows 10 system, CSS3&&HTML5 version, Dell G3 computer.
The content attribute is used with the :before and :after pseudo-elements to insert content.
The syntax is:
content: normal|none|counter|attr|string|open-quote|close-quote|no-open-quote|no-close-quote|url|initial|inherit;
The specified attribute value is as follows: 
The example is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>123</title>
<style>
a:after {
content: " (" attr(href) ")";
}
</style>
</head>
<body>
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</body>
</html>Output result:
The example is as follows:
Insert the current element number (specified type)
css:
<style>
*{margin: 0;padding: 0;box-sizing: border-box;}
li{list-style: none;}
.content{
position: relative;padding: 10px;
border: 1px solid #666;margin: 10px;
}
.fill-dom-index2 li{
position: relative;
counter-increment: my2;
}
.fill-dom-index2 li div::before{
/* 第二个参数为list-style-type，可用值见： http://www.w3school.com.cn/cssref/pr_list-style-type.asp*/
content: counter(my2,lower-latin)'- ';
color: #f00;
font-weight: 600;
}
</style>html:
<body>
<h1>5、插入当前元素编号(指定种类)</h1>
<div class="content fill-dom-index2">
<ul>
<li><div>我是第1个li标签</div></li>
<div>我是li标签中的第1个div标签</div>
<li><div>我是第2个li标签</div></li>
<li><div>我是第3个li标签</div></li>
<div>我是li标签中的第2个div标签</div>
<li><div>我是第4个li标签</div></li>
<li><div>我是第5个li标签</div></li>
</ul>
</div>
</body>(Learning video sharing: css video tutorial, html video tutorial)
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