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CSS初始化是指重设浏览器的样式(即reset.css)。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。
为了消除各浏览器对css默认的设置，保持网页在各浏览器中的外观保持一致，初始化css就显得非常必要了！很多时候出现的样式不兼容问题，都可以通过css初始化代码来解决。下面列举常用的一些方案：
1.最耗资源的，最简单的
* { padding: 0; margin: 0; border: 0; }
2.选择性初始化举例（综合）
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,legend,button
form,fieldset,input,textarea,p,blockquote,th,td {
padding: 0;
margin: 0;
}
/* 酌情修改 */
body {
background:#fff;color:#333;font-size:12px; margin-top:5px;font-family:"SimSun","宋体","Arial Narrow";
}
/* 短引用的内容可取值：‘‘或"" */
q:before,q:after {content:”;}
/* 缩写，图片等无边框 */
fieldset,img,abbr,acronym {border: 0 none;}
abbr,acronym {font-variant: normal;}
legend {color:#000;}
/* 清除特殊标记的字体和字号 */
address,caption,cite,code,dfn,em,strong,th,var {
font-weight: normal;
font-style: normal;
}
/* 上下标 */
sup {vertical-align: text-top;}
sub {vertical-align: text-bottom;}
/* 设置表格的边框被合并为一个单一的边框, 指定分隔边框模型中单元格边界之间的距离为0*/
table {
border-collapse: collapse;
border-spacing: 0;
}
/* 表格标题及内容居左显示 */
caption,th {text-align: left;}
input,img,select {vertical-align:middle;}
/* 清除列表样式 */
ol,ul {list-style: none;}
/* 输入控件字体 */
input,button,textarea,select,optgroup,option {
font-family:inherit;
font-size:inherit;
font-style:inherit;
font-weight:inherit;
}
/* 标题元素样式清除 */
h1,h2,h3,h4,h5,h6 {
font-weight: normal;
font-size: 100%;
}
/* 链接样式，颜色可酌情修改 */
del,ins,a {text-decoration:none;}
a:link {color:#009;}
a:visited {color:#800080;}
a:hover,a:active,a:focus {color:#c00; text-decoration:underline;}
/* 鼠标样式 */
input[type="submit"] {cursor: pointer;}
button {cursor: pointer;}
input::-moz-focus-inner { border: 0; padding: 0;}
.clear {clear:both;}
3.sina的
/* 全局样式 */
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.yahoo的
html {
background: none repeat scroll 0 0 #FFFFFF;
color: #000000;
}
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, textarea, p, blockquote, th, td {
margin: 0;
padding: 0;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
fieldset, img {
border: 0 none;
}
address, caption, cite, code, dfn, em, strong, th, var {
font-style: normal;
font-weight: normal;
}
li {
list-style: none outside 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 none;
font-variant: normal;
}
sup {
vertical-align: text-top;
}
sub {
vertical-align: text-bottom;
}
input, textarea, select {
font-family: inherit;
font-size: inherit;
font-weight: inherit;
}
input, textarea, select {
}
legend {
color: #000000;
}
body {
font: 13px/1.231 arial,helvetica,clean,sans-serif;
}
select, input, button, textarea {
font: 99% arial,helvetica,clean,sans-serif;
}
table {
font-size: inherit;
}
pre, code, kbd, samp, tt {
font-family: monospace;
line-height: 100%;
}
a {
text-decoration: none;
}
a:hover, a:focus {
text-decoration: underline;
}
strong {
font-weight: bold;
}
input[type="submit"] {
cursor: pointer;
}
button {
cursor: pointer;
}
5.博客园的
/*version: 2.7.0*/
html,body{color:#000;background:#FFF;}
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;
}
table{border-collapse:collapse;border-spacing:0;}
fieldset,img{border:0;}
address,caption,cite,code,dfn,em,strong,th,var,optgroup{
font-style:inherit;font-weight:inherit;
}
del,ins{text-decoration:none;}
li{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;font-variant:normal;}
sup{vertical-align:baseline;}
sub{vertical-align:baseline;}
legend{color:#000;}
input,button,textarea,select,optgroup,option{
font-family:inherit;font-size:inherit;font-style:inherit;font-weight:inherit;
}
input,button,textarea,select{*font-size:100%;}
.clear{clear:both;}
input::-moz-focus-inner{ border: 0;padding: 0;}
/*added*/
input[type=button],input[type=submit] {-webkit-appearance: button;}
6.admin10000.com的
/* css reset www.admin10000.com */
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;}
/* css common */
.clearfix:after {content: "."; display: block; height:0; clear:both; visibility: hidden;}
.clearfix { *zoom:1; }
上面是admin10000.com使用的CSS重置代码，这段代码是我比较喜欢用的一种方式，虽然还不够完美但是常用的几乎已经都包括了。
各主流浏览器下的默认css样式：ie6 | ie7 | ie8 | ie9 | Firefox 3.6.3 | Webkit (r57042) | Opera 10.51
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原文地址：http://www.cnblogs.com/ycxqdkf/p/5867601.html
