CSS reset--（来自网易）

/* reset */html,body,h1,h2,h3,h4,h5,h6,div,dl,dt,dd,ul,ol,li,p,blockquote,PRe,hr,figure,table,caption,th,td,form,fieldset,legend,input,button,textarea,menu{margin:0;padding:0;}header,footer,section,article,aside,nav,hgroup,address,figure,figcaption,menu,details{display:block;}table{border-collapse:collapse;border-spacing:0;}caption,th{text-align:left;font-weight:normal;}html,body,fieldset,img,iframe,abbr{border:0;}i,cite,em,var,address,dfn{font-style:normal;}[hidefocus],summary{outline:0;}li{list-style:none;}h1,h2,h3,h4,h5,h6,small{font-size:100%;}sup,sub{font-size:83%;}pre,code,kbd,samp{font-family:inherit;}q:before,q:after{content:none;}textarea{overflow:auto;resize:none;}label,summary{cursor:default;}a,button{cursor:pointer;}h1,h2,h3,h4,h5,h6,em,strong,b{font-weight:bold;}del,ins,u,s,a,a:hover{text-decoration:none;}body,textarea,input,button,select,keygen,legend{font:12px/1.14 arial,/5b8b/4f53;color:#333;outline:0;}body{background:#fff;}a,a:hover{color:#333;} 

概述：重置样式，清除浏览器默认样式，并配置适合设计的基础样式（强调文本是否大多是粗体、主文字色，主链接色，主字体等）。