css初始化

css初始化

css之所以要初始化，是要尽量减少各浏览器的兼容问题。因为各浏览器对某些标签的默认值是不同的，会产生页面上的差异，所以要保持网页在各浏览器中的外观保持一致，就要进行css初始化。

比如li元素,浏览器对元素的marign,border,font-size 等默认值略有不同，如果想要杜绝这种情况，我们就需要通过css强制让所有元素属性值都一样，这个过程就叫做css的初始化。

1.最简单的（最耗资源）

* { padding: 0; margin: 0; border: 0; }

2.选择性初始化举例

<span style="font-size:18px;">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;}</span>

3. 腾讯官网css初始化代码

<span style="font-size:18px;">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} </span>

4.新浪官网 css初始化

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;}

5.淘宝css初始化

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; }

6. 网易css初始化

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;}

7.雅虎css初始化

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;
}