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属性值简写与相对单位
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实例演示盒模型属性简写的规则

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>Title</title>
  6.     <style>
  7.         .box{
  8.             width: 10em;
  9.             height: 10em;
  10.             padding: 1em 2em 1em 2em;
  11.             border: 5px solid black;
  12.             background: content-box royalblue;
  13.             margin: 2em 5em 5em 2em;
  14.         }
  15.     </style>
  16. </head>
  17. <body>
  18.     <div class="box">
  19.         <p>内容文本</p>
  20.     </div>
  21. </body>
  22. </html>

实例演示em与rem应用的场景,并分析区别与联系

em：子元素字体大小的em是相对于父元素字体大小。
rem：rem是全部的长度都相对于根元素。

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>Title</title>
  6.     <style>
  7.         :root{
  8.             font-size: 2em;
  9.         }
  10.         h1{
  11.             font-size: 0.8rem;
  12.         }
  13.         p{
  14.             font-size: 0.6rem;
  15.         }
  17.     </style>
  18. </head>
  19. <body>
  20.     <h1>标题</h1>
  21.     <p>内容文本</p>
  22. </body>
  23. </html>
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：简写是推荐的方式, 但可读性会有影响, 互有利弊吧
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