表单域用fieldset包起来，并用legend说明其用途（注意在css初始化的时候把fieldset的border设为0，把legend的display设为none）
/*css reset*/
body,div,dl.dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{margin:0;padding:0;}
table{border-collapse: collapse;border-spacing: 0;}
fieldset,img{border: 0;}
address,caption,city,code,dfn,em,strong,th,var{font-style: normal;font-weight: normal;}
ol,ul{list-style: none;}
caption,th{text-align: left;}
h1,h2,h3,h4,h5,h6{font-size: 100%;font-weight:normal;}
q:before,q:after{content: ‘‘;}
abbr,acronym{border: 0;}
/*文字排版*/
.f12{font-size: 12px;}
.f13{font-size: 13px;}
.f14{font-size: 14px;}
.f16{font-size: 16px;}
.f20{font-size: 20px;}
.fb{font-weight: bold;}
.fn{font-weight: normal;}
.t2{text-indent: 2em;}
.lh150{line-height: 150%;}
.lh180{line-height: 180%;}
.lh200{line-height: 200%;}
.unl{text-decoration: underline;}
.no_unl{text-decoration: none;}
/*定位*/
.t1{text-align: left;}
.tc{text-align: center;}
.tr{text-align: right;}
.bc{margin-left: auto;margin-right: auto;}
.fl{float: left;display: inline;}
.fr{float: right;display: inline;}
.cb{clear: both;}
.cl{clear: left;}
.cr{clear: right;}
.clearfix:after{content: ‘.‘;display: block;height: 0;clear: both;visibility: hidden;}
.clearfix{display: inline-block;}* html
.clearfix{height: 1%;}
.clearfix{display: block;}
.vm{vertical-align: middle;}
.pr{position: relative;}
.pa{position: absolute;}
.abs-right{position: absolute;right: 0}
.zoom{zoom:1;}
.hidden{visibility: hidden;}
.none{display: none;}
/*长度高度*/
.w10{width:10px;}
.w20{width:20px;}
.w30{width:30px;}
.w40{width:40px;}
.w50{width:50px;}
.w60{width:60px;}
.w70{width:70px;}
.w80{width:80px;}
.w90{width:90px;}
.w100{width:100px;}
.w200{width:200px;}
.w250{width:250xp;}
.w300{width:300px;}
.w400{width:400px;}
.w500{width:500px;}
.w600{width:600px;}
.w700{width:700px;}
.w800{width:800px;}
.w{width:100%;}
.h50{height:50px;}
.h80{height:80px;}
.h100{height:100px;}
.h200{height:200px;}
.h{height:100%；}
/*边距*/
.m10{margin:10px;}
.m15{margin:15px;}
.m30{margin:30px;}
.mt5{margin-top:5px;}
.mt15{margin-top:15px;}
.mt20{margin-top:20px;}
.mt30{margin-top:30px;}
.mt50{margin-top:50px;}
.mt100{margin-top:100px;}
.mb5{margin-bottom::5px;}
.mb15{margin-bottom:15px;}
.mb20{margin-bottom:20px;}
.mb30{margin-bottom:30px;}
.mb50{margin-bottom:50px;}
.mb100{margin-bottom:100px;}
.ml5{margin-left:5px;}
.ml15{margin-left:15px;}
.ml20{margin-left:20px;}
.ml30{margin-left:30px;}
.ml50{margin-left:50px;}
.ml100{margin-left:100px;}
.mr5{margin-right:5px;}
.mr15{margin-right:15px;}
.mr20{margin-right:20px;}
.mr30{margin-right:30px;}
.mr50{margin-right:50px;}
.mr100{margin-right:100px;}
.p10{padding:10px;}
.p15{padding:15px;}
.p30{padding:30px;}
.pt5{padding-top:5px;}
.pt10{padding-top:10px;}
.pt15{padding-top:15px;}
.pt20{padding-top:20px;}
.pt30{padding-top:30px;}
.pt50{padding-top:50px;}
.pb5{padding-bottom:5px;}
.pb10{padding-bottom:10px;}
.pb15{padding-bottom:15px;}
.pb20{padding-bottom:20px;}
.pb30{padding-bottom:30px;}
.pb50{padding-bottom:50px;}
.pl5{padding-left:5px;}
.pl10{padding-left:10px;}
.pl15{padding-left:15px;}
.pl20{padding-left:20px;}
.pl30{padding-left:30px;}
.pl50{padding-left:50px;}
.pr5{padding-right:5px;}
.pr10{padding-right:10px;}
.pr15{padding-right:15px;}
.pr20{padding-right:20px;}
.pr30{padding-right:30px;}
.pr50{padding-right:50px;}
原文地址：http://www.cnblogs.com/Jafeney/p/3864073.html
