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                ## 背景(background) background是最常用的簡寫之一,它包含以下屬性: 1. background-color: color || #hex || RGB(% || 0-255) || RGBa; 2. background-image:url(); 3. background-repeat: repeat || repeat-x || repeat-y || no-repeat; 4. background-position: X Y || (top||bottom||center) (left||right||center); 5. background-attachment: scroll || fixed; background的簡寫可以大大的提高css的效率: `background: #fff url(img.png) no-repeat 0 0;` background的簡寫也有些默認值: `background: transparent none repeat scroll top left;` background屬性的值不會繼承,你可以只聲明其中的一個,其它的值會被應用默認的。
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