:before :after
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#p1:before{
content: "哈哈哈 ";
color: red;
}
#p1:after{
content: "哈哈哈";
color: #452dff;
}
content: url(‘img.jpg‘);
content: attr(href);
content: " (" attr(href) ")"
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 <style type="text/css"> 7 #p1:before{ 8 content: "哈哈哈 "; 9 color: red; 10 } 11 12 #p1:after{ 13 content: "哈哈哈"; 14 color: #452dff; 15 } 16 17 #a1:after{ 18 content: attr(href); 19 } 20 21 22 #yin-yang { 23 width: 96px; 24 height: 48px; 25 background: #eee; 26 border-color: red; 27 border-style: solid; 28 border-width: 2px 2px 50px 2px; 29 border-radius: 100%; 30 position: relative; 31 } 32 33 #yin-yang:before { 34 content: ""; 35 position: absolute; 36 top: 50%; 37 left: 0; 38 background: #eee; 39 border: 18px solid red; 40 border-radius: 100%; 41 width: 12px; 42 height: 12px; 43 } 44 45 #yin-yang:after { 46 content: ""; 47 position: absolute; 48 top: 50%; 49 left: 50%; 50 background: red; 51 border: 18px solid #eee; 52 border-radius:100%; 53 width: 12px; 54 height: 12px; 55 } 56 </style> 57 </head> 58 <body> 59 <p id="p1">我是一个兵 </p> 60 <a id="a1" href="https://www.baidu.com">百度</a> 61 <br> 62 <div id="yin-yang"></div> 63 </body> 64 </html>
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