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- <!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>
- /* ::after在当前元素的最后面添加一个伪元素（假的标签） */
- .box::after{
- content: "world";
- }
- /* ::before在当前元素的前面添加一个伪元素（假的标签） */
- .box::before{
- content: "hello";
- }
- </style>
- </head>
- <body>
- <div class="box">
- 123456
- </div>
- </body>
- </html>
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