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The content attribute is generally used in ::before and ::after pseudo-elements to present the content of the pseudo-element.
Detailed explanation of usage
1. Insert pure characters
<style>
*{margin: 0;padding: 0;box-sizing: border-box;}
li{list-style: none;}
.content{
position: relative;padding: 10px;
border: 1px solid #666;margin: 10px;
}
.content.only-text::before{
content: '插入纯字符';
}
</style>
<body>
<h1>1、插入纯字符</h1>
<div class="content only-text"></div>
</body>(Video tutorial recommendation: css video tutorial)
2. Insert pictures
<style>
*{margin: 0;padding: 0;box-sizing: border-box;}
li{list-style: none;}
.content{
position: relative;padding: 10px;
border: 1px solid #666;margin: 10px;
}
.content.fill-image::before{
content: url('https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo_top_86d58ae1.png');
}
</style>
<body>
<h1>2、插入图片</h1>
<div class="content fill-image"></div>
</body>3. Insert element attributes
<style>
*{margin: 0;padding: 0;box-sizing: border-box;}
li{list-style: none;}
.content{
position: relative;padding: 10px;
border: 1px solid #666;margin: 10px;
}
.content.fill-dom-attr::before{
content: attr(data-title);
}
</style>
<body>
<h1>3、插入元素属性</h1>
<div class="content fill-dom-attr" data-title="我是.fill-dom-attr元素的 data-title 属性值"></div>
</body> 4. Insert the current element number (i.e. the current element index)
This feature can be used for rule introduction on active pages.
<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-index li{
position: relative;
/* 给计数器加器起个名字，它只会累加 li 标签的索引，li元素中间的div并不会理会 */
counter-increment: my;
}
.fill-dom-index li div::before{
/* 使用指定名字的计算器 */
content: counter(my)'- ';
color: #f00;
font-weight: 600;
}
</style>
<body>
<h1>4、插入当前元素编号(即当前元素索引)</h1>
<div class="content fill-dom-index">
<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>5. Insert the current element number (specified type)
<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>
<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>Recommended tutorial: css quick getting Started
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