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                ## 盒子大小 這里主要用于兩個屬性:margin和padding,我們以margin為例,padding與之相同。盒子有上下左右四個方向,每個方向都有個外邊距: `margin-top: 1px; margin-right: 2px; margin-bottom: 3px; margin-left: 4px;` 這四個值可以縮寫到一起: `margin: 1px 2px 3px 4px;` 縮寫的順序是上->右->下->左。順時針的方向。相對的邊的值相同,則可以省掉: margin:1px;//四個方向的邊距相同,等同于margin:1px 1px 1px 1px; margin:1px 2px;//上下邊距都為1px,左右邊距均為2px,等同于margin:1px 2px 1px 2px margin:1px 2px 3px;//右邊距和左邊距相同,等同于margin:1px 2px 3px 2px; margin:1px 2px 1px 3px;//注意,這里雖然上下邊距都為1px,但是這里不能縮寫。
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