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状态伪类与盒模型的五个核心属性实例演示
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一.状态伪类实例演示

1.输出成果
不点击提交的效果

点击提交时的效果

2.代码部分
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>状态伪类</title>
  8.     <style>
  10.     /* 可以输入状态下的文字提示 */
  11.     input:enabled {
  12.     color: #2b2;
  13.     }
  14.     /* 不可输入状态下的文字提示 */
  15.     input:disabled {
  16.     color: #aaa;
  17.     }
  19.     /* 点击提交按钮的文字效果 */
  20.     button:active {
  21.     color: red;
  22.     }
  23.     </style>
  24. </head>
  25. <body>
  26.     <form action="url_of_form">
  27.     <fieldset>
  28.         <label for="FirstField">用户名:</label>
  29.         <input type="text" id="First" value="请输入用户名"><br>
  30.         <label for="SecondField">密码:</label>
  31.         <input type="text" id="Second" value="请输入密码" disabled="disabled"><br>
  32.         <button>提交</button>
  33.       </form>
  34.     </fieldset>
  35. </body>
  36. </html>

二.盒模型的五个核心属性实例演示

1.输出成果

2.代码部分
  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>盒模型</title>
  8.   </head>
  9.   <body>
  10.     <div class="box">
  11.         <h4>我爱我的国家中国</h4>
  12.         <h4>我爱我的国家中国</h4>
  13.         <h4>我爱我的国家中国</h4>
  14.         <h4>我爱我的国家中国</h4>
  15.     </div>
  16.     <style>
  17.       .box {
  18.         /* 1.宽度 */
  19.         width: 200px;
  20.         /* 2.高度 */
  21.         height: 200px;
  22.         /* 3.边框 */
  23.         border: 3px dashed green;
  24.         /* 4.内边距 */
  25.         padding: 5px 10px 5px;
  26.         /* 5.外边距 */
  27.         margin: 20px;
  28.       }
  29.     </style>
  30.   </body>
  31. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：可以，效果不错，继续加油
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