CSS初始化是指重设浏览器的样式。不同的浏览器默认的样式可能不尽相同，所以开发时的第一件事可能就是如何把它们统一。如果没对CSS初始化往往会出现浏览器之间的页面差异。每次新开发网站或新网页时候通过初始化CSS样式的属性，为我们将用到的CSS或html标签更加方便准确，使得我们开发网页内容时更加方便简洁，同时减少CSS代码量，节约网页下载时间。

1. [代码]雅虎css初始化代码

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,button,textarea,p,blockquote,th,td { margin:0; padding:0; }

body { background:#fff; color:#555; font-size:14px; font-family: Verdana, Arial, Helvetica, sans-serif; }

td,th,caption { font-size:14px; }

h1, h2, h3, h4, h5, h6 { font-weight:normal; font-size:100%; }

address, caption, cite, code, dfn, em, strong, th, var { font-style:normal; font-weight:normal;}

a { color:#555; text-decoration:none; }

a:hover { text-decoration:underline; }

img { border:none; }

ol,ul,li { list-style:none; }

input, textarea, select, button { font:14px Verdana,Helvetica,Arial,sans-serif; }

table { border-collapse:collapse; }

html {overflow-y: scroll;}

.clearfix:after {content: "."; display: block; height:0; clear:both; visibility: hidden;}

.clearfix { *zoom:1; }

2. [代码]腾讯css初始化代码

body,ol,ul,h1,h2,h3,h4,h5,h6,p,th,td,dl,dd,form,fieldset,legend,input,textarea,select{margin:0;padding:0}

body{font:12px"宋体","Arial Narrow",HELVETICA;background:#fff;-webkit-text-size-adjust:100%;}

a{color:#2d374b;text-decoration:none}

a:hover{color:#cd0200;text-decoration:underline}

em{font-style:normal}

li{list-style:none}

img{border:0;vertical-align:middle}

table{border-collapse:collapse;border-spacing:0}

p{word-wrap:break-word}

3. [代码]新浪初始化代码

body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div{margin:0;padding:0;border:0;}

body{background:#fff;color:#333;font-size:12px; margin-top:5px;font-family:"SimSun","宋体","Arial Narrow";}

ul,ol{list-style-type:none;}

select,input,img,select{vertical-align:middle;}

a{text-decoration:none;}

a:link{color:#009;}

a:visited{color:#800080;}

a:hover,a:active,a:focus{color:#c00;text-decoration:underline;}

4. [代码]淘宝初始化代码

body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, form, fieldset, legend, button, input, textarea, th, td { margin:0; padding:0; }

body, button, input, select, textarea { font:12px/1.5tahoma, arial, 5b8b4f53; }

h1, h2, h3, h4, h5, h6{ font-size:100%; }

address, cite, dfn, em, var { font-style:normal; }

code, kbd, pre, samp { font-family:couriernew, courier, monospace; }

small{ font-size:12px; }

ul, ol { list-style:none; }

a { text-decoration:none; }

a:hover { text-decoration:underline; }

sup { vertical-align:text-top; }

sub{ vertical-align:text-bottom; }

legend { color:#000; }

fieldset, img { border:0; }

button, input, select, textarea { font-size:100%; }

table { border-collapse:collapse; border-spacing:0; }