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                            ### 1.寬度、高度繼承
a.子元素不設置width,它會繼承父元素的width
![](https://box.kancloud.cn/f66399ae18aaf178cb86b909e965b9a3_400x482.png)
b.父元素不設置高度,它會繼承(獲取)子元素的高度
![](https://box.kancloud.cn/d98dfe1dd11d875046886c2c764c7296_480x500.png)
c.子元素給絕對定位,不會繼承父元素的width
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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