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box-sizing功能，相对定位/绝对定位
手机用户1615433136
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box-sizing

  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>box-sizing</title>
  8.     <style>
  9.       /* 初始化 */
  10.       * {
  11.         margin: 0;
  12.         padding: 0;
  13.         /* 将盒子的padding 和border 计算在width，height内 */
  14.         box-sizing: border-box;
  15.       }
  16.       html {
  17.         font-size: 16px;
  18.       }
  19.       /* em rem  */
  20.       /* em :根据元素上下文来确定它的值 */
  21.       /* rem :根据元素的字号来设置 */
  22.       .box {
  23.         font-size: 16px;
  24.         width: 20rem;
  25.         height: 20rem;
  26.         border: 2px solid;
  28.         /* padding: 上，右，下，左;顺时针顺序 */
  29.         padding: 10px 5px 5px 10px;
  30.         /* 三值：左右相同，而上下不同 */
  31.         padding: 8px 10px 8px;
  32.         /* 二值进行简化 */
  33.         padding: 8px 10px;
  35.         background-color: lightseagreen;
  36.         /* 再转为标准盒子 */
  37.         box-sizing: content-box;
  39.         background-clip: content-box;
  40.       }
  41.     </style>
  42.   </head>
  43.   <body>
  44.     <div class="box">box</div>
  45.   </body>
  46. </html>

<hr/>

视口

  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>vh /vw</title>
  8.     <style>
  9.       * {
  10.         margin: 0;
  11.         padding: 0;
  12.         box-sizing: border-box;
  13.       }
  14.       /* 视口：可视窗口，手机端为了显示全PC页面，默认为980px */
  15.       /* vh :1vh = 视口高度的1/100，vh =view height */
  16.       /* vw :1vw =视口宽度的1/100，vw =view width  */
  18.       .box {
  19.         background-color: limegreen;
  20.         width: 50vw;
  21.         height: 25vh;
  22.         margin: 20px auto;
  23.       }
  24.     </style>
  25.   </head>
  26.   <body>
  27.     <div class="box"></div>
  28.   </body>
  29. </html>

<hr/>

相对定位/绝对定位

  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>定位</title>
  8.     <style>
  9.       /* html {
  10.         border: 1px solid black;
  11.       } */
  12.       .box {
  13.         width: 20em;
  14.         height: 15em;
  15.         background-color: lightgreen;
  16.         /* 默认：静态定位，就是没有定位 */
  17.         /* position: static; */
  18.         /* 相对定位：自动转为定位元素 */
  19.         /* 定位元素：只要这个元素上有非static的定位属性，就是定位元素 */
  20.         /* position: relative; */
  22.         /* 只要是定位元素，定位偏移量有效 */
  23.         /* 相对于它在文档流中的原始位置进行定位 */
  24.         /* top: 5em;
  25.     left: 4em; */
  27.         /* 绝对定位 */
  28.         position: absolute;
  29.         /* 绝对定位元素脱离了文档流 */
  30.         /* 文档流:显示顺序与书写顺序一致 */
  31.         top: 5em;
  32.         left: 4em;
  33.       }
  34.       .parent {
  35.         border: 1px solid #000;
  36.         /* ]转为定位元素,作为绝对定位元素的定位父级/定位参考/定位包含块 */
  37.         position: relative;
  38.         top: 4em;
  39.         left: 4em;
  40.         min-height: 30em;
  41.       }
  42.     </style>
  43.   </head>
  44.   <body>
  45.     <div class="parent">
  46.       <div class="box"></div>
  47.     </div>
  48.   </body>
  49. </html>
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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