How to use content attribute in css-Front-end Q&A-php.cn

How to use content attribute in css

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Release： 2022-06-30 11:20:57

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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;".

How to use content attribute in css

The operating environment of this tutorial: Windows 10 system, CSS3&&HTML5 version, Dell G3 computer.

How to use the content attribute in css

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;

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The specified attribute value is as follows:
How to use content attribute in css

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>

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Output result:

How to use content attribute in css

The example is as follows:

Insert the current element number (specified type)

How to use content attribute in css

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)&#39;- &#39;;
        color: #f00;
        font-weight: 600;
    }
</style>

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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>

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(Learning video sharing: css video tutorial, html video tutorial)

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