A.block B.inline-block C.inline D.none
A.inline B.block C.none D.rows
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;