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@@ -0,0 +1,52 @@
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+<!DOCTYPE html>
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+<html lang="en">
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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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+ div {
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+ width: 200px;
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+ height: 200px;
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+ border: 2px solid #000;
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+ padding: 20px;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <!--
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+ 盒模型:
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+ 1.标准盒模型 box-sizing:content-box;
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+ 2.怪异盒模型(IE盒模型)box-sizing:border-box;
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+ -->
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+ <!--
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+ margin:外边距 复合属性
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+ padding:内边距
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+ -->
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+ <!--
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+ 浮动:float
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+ 1.溢出隐藏法 overflow:hidden|auto;
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+ 2.额外标签法 clear:both|left|right|none;
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+ 3.伪元素清浮动 .clearfix::after{
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+ content:"",
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+ clear:both,
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+ display:block;
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+ }
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+ -->
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+ <!--
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+ display:block;将元素转成块元素
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+ display:inline;将元素转成行内元素
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+ display:inline-block;将元素转成行内块元素
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+ -->
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+ <!--
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+ 选择器的优先级
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+ !important 正无穷
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+ 内联(行内) 1,0,0,0
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+ id选择器 0,1,0,0
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+ 类选择器 = 伪类选择器 = 属性选择器 0,0,1,0
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+ 标签选择器 = 伪元素选择器 0,0,0,1
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+ 通配符选择器 * 0,0,0,0
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+ -->
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+ <div></div>
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+</body>
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+</html>
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