單項選擇題(網(wǎng)站)()樣式可以定義一個10px藍(lán)色向下的三角形?

A.width:0;height:0;border:10pxsolidtransparent;border-top-color:#00f;
B.width:10px;height:10px;border:10pxsolid#00f;border-top-color:transparent;
C.width:0;height:0;border:10pxsolidtransparent;border-bottom-color:#00f;
D.width:10px;height:10px;border:0pxsolid#00f;border-bottom-width:10px;


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1.單項選擇題(網(wǎng)站)為所有l(wèi)i元素底部定義2像素紅色虛線邊框,樣式正確的是?()

A.border-bottom:2pxdashedred;
B.border-down:2pxdashedred;
C.border-bottom:2pxsolidred;
D.border:2pxdashedred;

4.單項選擇題(網(wǎng)站)background-color:#ccc;background-image:url(bg.png);background-repeat:no-repeat;background-position:-100pxcenter;以上樣式的縮寫正確的是?()

A.background:#ccc,url(bg.png)no-repeat,-100pxcenter;
B.background:#cccurl(bg.png)no-repeat-100pxcenter;
C.background:#ccc;background-image:url(bg.png)no-repeat-100pxcenter;
D.background-color:#ccc;background-image:url(bg.png)no-repeat-100pxcenter;