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盒模型常用属性与盒大小计算方式
P粉019280626
Original
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Gao的作业-盒模型常用属性与盒大小计算方式</title>
</head>
<body>

  1.     <div class="box">这是一个盒子</div>
  3.     <style>
  4.         * {
  5.     margin: 0;
  6.     padding: 0;
  7. /*     box-sizing: border-box; */
  8. }
  12.         .box{
  13.             width:200px;
  14.             height:100px;
  15.             padding:10px;
  16.             border:30px red solid;
  17.             /* 外边距写上以后，自动匹配html根元素还是body元素并没有计算在盒的长度里。 */
  18. /*             margin:15px; */ 
  20. /* 原大小是200*100,加上了边框30和内边10。所以现在的盒是width:200+10+10+30+30=280px    height:100+10+10+30+30=180px */
  22. /*如果想要所见即所得大小，就要打开box-sizing: border-box 开关*/
  23.         }
  25.     </style>
  27. </body>
  28. </html>
  30.     ![](https://img.php.cn/upload/image/347/943/953/1676177702257219.jpg)
  31. ![](https://img.php.cn/upload/image/652/645/690/1676177717303798.jpg)
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：最后这两个图片，不要放在代码块里应该就显示出来了
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