1.W3C盒模型结构
![](https://img.haomeiwen.com/i11715178/0f044543d93c5f37.png)
1.width=content宽;height=content高
2.IE盒模型
![](https://img.haomeiwen.com/i11715178/5f7b40906ed34943.jpg)
1.width = content宽+paddingLeft+paddingRight+boderLeft+boderRight
2.height = content高+paddingTop+paddingBottom+boderTop+boderBottom
3.解决兼容性问题(文档说明,使用W3C标准)
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
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