font缩写
font:font-style|font-variant|font-weight|font-size|line-height|font-family 如：p{ font:italic normal bold 12px/18px 宋体; }
p对象出现斜体 大小写默认 加粗 12px大小 18px行高 宋体
margin/padding缩写
margin:top right bottom left; padding:top right bottom left;
border缩写
border:border-width|border-style|color; border-top |right |bottom |left; border-color:top |right |bottom |left; border-style:top |right |bottom |left;
background缩写
background:#dedede url(sss.jpg) no-repeat 30% 20px;
color缩写
如：#ffffff-->#fff #2255bb-->#25b