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                [toc] ## 一般元素都是相對于padding-box定位 對,是padding-box,而不是content-box(準確來說相對于padding-box的**內邊緣**) 證據就是當你將content置為0只設置一個padding的時并且overflow置為hidden,你會發現子元素的**左上角原點**被定位在父盒子的**padding-top,padding-left**處,并且**不**會被隱藏 ## padding的百分比單位的特殊性 和margin一樣,padding的百分比是按照父元素的寬度計算的,不論寬還是高 并且如果有定位,是按照定位父級的寬度來計算 由于寬高都是按照父級的百分比來計算,一些**固定比例**的**布局**就很適合用padding來**站位**(需要配合`height:0`)
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