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框架元素与CSS基础
alex
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用<iframe>写一个简单的后台布局, 注意a.target与iframe.name的配合

  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>iframe示例:网站后台管理</title>
  8. </head>
  9. <body>
  10.     <header>
  11.         <h1>网站后台管理系统<small>(v1.0)</small></h1>
  12.         <section>
  13.             <em>admin</em>
  14.             <button onclick="logout()">退出</button>
  15.         </section>
  16.     </header>
  17.     <nav>
  18.         <a href="https://www.php.cn/" target="content">php中文网</a>
  19.         <a href="https://www.bilibili.com/" target="content">bilibili</a>
  20.         <a href="https://laravel.com/" target="content">laravel</a>
  21.     </nav>
  22.     <iframe src="https://www.php.net/" frameborder="0" name="content"></iframe>
  23.     <script>
  24.         function logout()
  25.         {
  26.             return confirm('是否真的退出？')?alert("成功退出！"):false
  27.         }
  28.     </script>
  29. </body>
  30. </html>

实例演示html元素的样式来源与优先级(要有图示)

html元素样式来源与优先级

来源：自定义样式和预置样式
优先级：自定义样式>预置样式

预置样式

自定义样式

自定义样式来源和优先级

  1. 行内样式
  2. 文档样式
  3. 外部样式
  4. 优先级：行内样式>文档样式>外部样式

外部样式

文档样式

行内样式

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：很好，继续加油
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