CSS缩写

font: 14px/1.3 Arial,sans-serif;

　　相当于

font-style: normal;

font-variant: normal;

font-weight: normal;

font-size: 14px;

line-height: 1.3;

font-family: Arial, sans-serif;

--------------------------------------------------

 #nav, #nav ul {

 　　list-style: none outside none;

}

　　相当于

　　list-style-type: none;

　　list-style-position: outside;

　　list-style-image: none;

--------------------------------------------------

background: url('menu_bg.png') no-repeat scroll 0 0 transparent;

相当于

background-image: url(menu_bg.png);

background-repeat-x: no-repeat;

background-repeat-y: no-repeat;

background-attachment: scroll;

background-position-x: 0px;

background-position-y: 0px;

background-origin: initial;

background-clip: initial; //初始

background-color: transparent; //透明

--------------------------------------------------

border-radius: 0 5px 5px 5px;

相当于

border-top-left-radius: 0px;

border-top-right-radius: 5px;

border-bottom-right-radius: 5px;

border-bottom-left-radius: 5px;

--------------------------------------------------

border-width: 0 2px 4px 1px;

相当于

border-top-width: 0px;

border-right-width: 2px;

border-bottom-width: 4px;

border-left-width: 1px;

--------------------------------------------------

border-width: 0 2px 1px;

相当于

border-top-width: 0px;

border-right-width: 2px;

border-bottom-width: 1px;

border-left-width: 2px;