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                            [TOC]


## 概述
```
box-sizing: content-box;
box-sizing: border-box;
```
- `content-box`(默認值): `width` 與 `height` 只會應用到這個元素的內容區`border` 或 `padding`不再 `width`中
- `border-box`: width = border + padding + 內容的  width，

在響應式布局中,推薦使用`border-box`

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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