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                ## CSS 盒模型 盒模型分為 標準盒模型(w3c) 和 IE盒模型 標準模型中,盒模型設置的寬高(width、height)只是內容(content)的寬高 IE模型中盒模型設置的寬高(width、height)是內容(content)+填充(padding)+邊框(border)的總寬高 如 div 設置成: width:200px, padding: 20px, border: 1px 標準盒模型: div 實際占用的寬度是 242 = 200 + 40(左右padding) + 2(左右border) IE 盒模型: div 實際占用的寬度是200 ![](https://img.kancloud.cn/67/a1/67a1be1f7e7e9b461e58cdb3c714bab5_2435x751.png) ![](https://img.kancloud.cn/94/c9/94c94f2746a615f70bf17edb101504f1_2561x702.png) 現在可以手動設置盒模型 ~~~ /* 標準模型 */ box-sizing:content-box; /*IE模型*/ box-sizing:border-box; ~~~
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