CSS初始化是指重设浏览器的样式，是为了减少各浏览器之间的兼容性问题!
腾讯官网
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} 新浪官网
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;} 淘宝官网
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, \5b8b\4f53; }
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; }网易官网
html {overflow-y:scroll;}
body {margin:0; padding:29px00; font:12px"\5B8B\4F53",sans-serif;background:#ffffff;}
div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,blockquote,p{padding:0; margin:0;}
table,td,tr,th{font-size:12px;}
li{list-style-type:none;}
img{vertical-align:top;border:0;}
ol,ul {list-style:none;}
h1,h2,h3,h4,h5,h6{font-size:12px; font-weight:normal;}
address,cite,code,em,th {font-weight:normal; font-style:normal;} 雅虎官网
/*css reset code */
/**** 文字大小初始化,使1em=10px *****/
body {
font-size:62.5%;
} /* for IE/Win */
html>body {
font-size:10px;
} /* for everything else */
/*字体边框等初始化*/
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td {
padding: 0;
margin: 0;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
fieldset,img {
border: 0;
}
img {
display:block;
}
address,caption,cite,code,dfn,th,var {
font-weight: normal;
font-style: normal;
}
ol,ul {
list-style: none;
}
caption,th {
text-align: left;
}
h1,h2,h3,h4,h5,h6 {
font-weight: normal;
font-size: 100%;
}
q:before,q:after {
content:'';
}
abbr,acronym { border: 0;
}
a {
text-decoration:none;
}