1 <!DOCTYPE html> 2 <html lang="en"> 3 4 <head> 5 <meta charset="UTF-8"> 6 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 7 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 8 <meta name="author" content="杨欣"> 9 <title>css3伪元素::before的使用</title> 10 <style> 11 h3{ 12 font-size: 24px; 13 margin: 0; 14 padding: 0; 15 white-space: nowrap; 16 overflow: hidden; 17 text-overflow: ellipsis 18 } 19 h3::before{ 20 content: attr(title); 21 color: #fff; 22 background: rgb(197, 50, 30); 23 font-size: 16px; 24 margin-right: 10px; 25 padding: 5px 26 } 27 </style> 28 </head> 29 30 <body> 31 <h3 title="置顶">这是文章的标题，这是文章的标题，这是文章的标题。</h3> 32 </body> 33 34 </html>