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-     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
-     <title>Document</title>
 
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-         div {
 
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-             height: 220px;
 
-             background: #00f;
 
-             border: 3px solid #0f0;
 
-             padding: 20px;
 
-             margin: 10px;
 
-             box-sizing: content-box;
 
-         }
 
-         /* 
 
-             盒模型:
 
-                 标准盒模型:
 
-                      box-sizing:content-box
 
-                     宽度 = 内容宽度 + 边框 + 内边距
 
-                 怪异盒模型(IE盒模型):
 
-                      box-sizing:border-box
 
-                     宽度 = 内容宽度(弹性的witdh +  边框 + 内边距 )
 
-         */
 
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