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                ## 邊框(border) border是個比較靈活的屬性,它有border-width、border-style、border-color三個子屬性。 1. border-width:數字+單位; 2. border-style: none || hidden || dashed || dotted || double || groove || inset || outset || ridge || solid ; 3. border-color: 顏色 ; 它可以按照width、style和color的順序簡寫: `border: 5px solid #369;` 有的時候,border可以寫的更簡單些,有些值可以省掉,但是請注意哪些是必須的,你也可以測試一下: 1. border:groove red; //大家猜猜這個邊框的寬度是多少? 2. border:solid; //這會是什么樣子? 3. border:5px; //這樣可以嗎? 4. border:5px red; //這樣可以嗎?? 5. border:red; //這樣可以嗎??? 通過上面的代碼可以了解到,border默認的寬度是3px,默認的色彩是black——黑色。默認的顏色是該規則中的color屬性的值,而color默認是黑色的。border的縮寫中border-style是必須的。 同時,還可以對每條邊采用縮寫: `border-top: 4px solid #333; border-right: 3px solid #666; border-bottom: 3px solid #666; border-left: 4px solid #333;` 還可以對每個屬性采用縮寫: `border-width: 1px 2px 3px; border-style: solid dashed dotted groove; border-color: red blue white black;`
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