1.font系列
font-style: italic;
font-weight: bold;
font-size: .8em;
line-height: 1.2;
font-family: Arial, sans-serif;
font：font-style font-weight font-size line-hight font-family；
2.background系列
background-color: #000;
background-image: url(images/bg.gif);
background-repeat: no-repeat;
background-position: top right;
background:#000 url(...) no-repeat top right;
原文：https://www.cnblogs.com/woaiacfun/p/13796539.html