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                            ### box-sizing
*****
`box-sizing`的默認值`content-box`，還有一個`padding-box`，基本沒什么用到。
當`box-sizing: border-box; `時，則實際寬高：`content+padding+border`，方便計算尺寸。
*****
#### 推薦寫法
```
*,*:before,*:after  {  
    -webkit-box-sizing: border-box;  
    -moz-box-sizing: border-box;  
    box-sizing: border-box;  
}
  /* 兼容處理 */
*, *:before, *:after {
  /* Chrome 9-, Safari 5-, iOS 4.2-, Android 3-, Blackberry 7- */
  -webkit-box-sizing: border-box; 

  /* Firefox (desktop or Android) 28- */
  -moz-box-sizing: border-box;

  /* Firefox 29+, IE 8+, Chrome 10+, Safari 5.1+, Opera 9.5+, iOS 5+, Opera Mini Anything, Blackberry 10+, Android 4+ */
  box-sizing: border-box;
}

```

出處：https://css-tricks.com/international-box-sizing-awareness-day/
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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