lovecoding
/
W250511


			
				
					
						
						
							1234567891011121314151617181920212223242526272829
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 伪元素 ::after 向页面指定的标签后边添加内容 */
        div::after{
            content: "";
            color: red;
            font-size: 30px;
            background-color: blue;
            height: 100px;
            width: 200px;
            display: block;
        }
        /* 伪元素 ::before 向页面指定的标签前面添加内容 */
        div::before{
              content: "你好";  
        }
    </style>
</head>
<body>
    <div>
        <span>hello</span>
    </div>
</body>
</html>