图解CSS3----6-伪元素选择器

 效果：

 

 

代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
	<title>伪元素选择器</title>
   <style type="text/css">
   	   .head{
   	   	  margin: 0 0 0 100px;
          height: 80px;
   	   }
   	   .container{
   	   	 margin: 0 0 0 100px;
   	   }
       p{
        width: 400px;
        height: 60px;
        border: 1px solid red;
        position: relative;
        top: 0;
        left: 0;
       }
       div{
        width: 400px;
        height: 200px;
        margin: 20px 0 0 0;
       }
       p::before{
           position: relative;
           display: block;
           top: 20px;
           left: 20px;
           width: 0;
           height: 0;
           float: left;
           content: "";
           border: 10px solid red;
           border-color: red transparent transparent transparent;
       }
        p::after{
           position: relative;
           display: block;
           top: 20px;
           right: 20px;
           width: 0;
           float: right;
           height: 0;
           content: "";
           border: 10px solid red;
           border-color: red transparent transparent transparent;
       }
       .div1:first-letter{
        font-weight: bold;
        color: red;
        font-size: 30px;
       }
       .div2:first-line{
        font-weight: bold;
        color: red;
        font-size: 30px;
       }   
       .div3::selection{
           color: white;
           background-color: black;
       }
       .div3::-moz-selection{
           color: white;
            background-color: black;
       }
       .div3::-webkit-selection{
           color: white;
            background-color: black;
       }
   </style>
</head>
<body>
    <div class="head">
      <h1>伪元素选择器</h1>
      <h2><a href="inde.html">首页</a></h2>
    </div>
    <div class="container">
         <p>::before,::after</p>
         <div class = 'div1'>
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         </div>


         <div class = 'div2'>
                Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺
                Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺
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         </div>

         <div class = 'div3'>
                Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺
                Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺
                Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺
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                Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺Sunlike阿理旺旺
         </div>

    </div>
</body>
</html>

　　总结：

1、first-letter： 获取第一个字母或中文字；

2、first-line：给block，inline-block，table-capttion，table-cell元素提供选取第一行元素的功能；

3、::before,::after：给元素添加额外的块；

4、selection：被选中的文本内容。

 

posted @ 2017-07-24 12:26  SunLike阿理旺旺  阅读(269)  评论(0)    收藏  举报