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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ /* 盒子模型 分为标准盒子模型和怪异(IE)盒子模型 */
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+ /* 标准盒子模型 元素尺寸=内容宽度+内边距+边框宽度 */
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+ /* .box{
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+ width: 200px;
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+ height: 200px;
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+ border:1px solid black;
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+ padding: 20px;
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+ margin:20px;
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+ } */
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+ /* 怪异(IE)盒子模型 元素尺寸=内容宽度 */
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+ .box {
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+ width: 200px;
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+ height: 200px;
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+ border: 1px solid black;
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+ padding: 20px;
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+ margin: 20px;
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+ box-sizing: border-box;
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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <div class="box">
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+ hello world
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+ </div>
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+</body>
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+
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+</html>
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