重置默认样式 最近看到一个词叫css reset。什么叫做css reset呢？
我理解为重置css，也就是重置默认样式。我在中讲到，一些标签元素在HTML下有一个默认属性值，我们在写css页面的时候，为了避免在css中重复定义它们，我们需要重置默认样式（css reset）。
每个人的用法和写法都不一样。找到一篇关于 可以看看国外使用css reset的比例调查。
这里有一篇总结css reset比较全面的文章，列举了多种css reset的写法，可以看看。 接下来我也查看了国内的两个网站，用Firebug按F12看看他们的css reset怎么写的？
淘宝：
html { overflow-x: auto;
overflow-y: scroll;
}body, dl, dt, dd, ul, ol, li, pre, form, fieldset, input, p, blockquote, th, td {
font-weight: 400;
margin: 0;
padding: 0;
}h1, h2, h3, h4, h4, h5 {
margin: 0;
padding: 0;
}body { background-color: #FFFFFF;
color: #666666;
font-family: Helvetica,Arial,sans-serif;
font-size: 12px;
padding: 0 10px;
text-align: left;
}select { font-size: 12px;
}table { border-collapse: collapse;
}fieldset, img { border: 0 none;
}fieldset { margin: 0;
padding: 0;
}fieldset p { margin: 0;
padding: 0 0 0 8px;
}legend { display: none;
}address, caption, em, strong, th, i {
font-style: normal;
font-weight: 400;
}table caption {
margin-left: -1px;
}hr { border-bottom: 1px solid #FFFFFF;
border-top: 1px solid #E4E4E4;
border-width: 1px 0;
clear: both;
height: 2px;
margin: 5px 0;
overflow: hidden;
}ol, ul { list-style-image: none;
list-style-position: outside;
list-style-type: none;
}caption, th {
text-align: left;
}q:before, q:after, blockquote:before, blockquote:after { content: "";
} |
百度有啊：（架构基本上是模仿YUI来做的）
body { font-family: arial,helvetica,sans-serif;
font-size: 13px;
font-size-adjust: none;
font-stretch: normal;
font-style: normal;
font-variant: normal;
font-weight: normal;
line-height: 1.4;
text-align: center;
}body, ul, ol, dl, dd, h1, h2, h3, h4, h5, h6, p, form, fieldset, legend, input, textarea, select, button, th, td {
margin: 0;
padding: 0;
}h1, h2, h3, h4, h5, h6 {
font-size: 100%;
font-weight: normal;
}table { font-size: inherit;
}input, select { font-family: arial,helvetica,clean,sans-serif;
font-size: 100%;
font-size-adjust: none;
font-stretch: normal;
font-style: normal;
font-variant: normal;
font-weight: normal;
line-height: normal;
}button { overflow: visible;
}th, em, strong, b, address, cite { font-style: normal;
font-weight: normal;
}li { list-style-image: none;
list-style-position: outside;
list-style-type: none;
}img, fieldset { border: 0 none;
}ins { text-decoration: none;
} |
在《超越css》一书中建议我们做网站开始重置所有默认样式：
/* Normalizes margin,padding */body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,p,blockquote,th,td {
margin: 0;
padding: 0
}/* Normalizes font-size for headers */h1,h2,h3,h4,h5,h6 {
font-size: 100%
}/* Removes list-style from lists */ol,ul { list-style: none
}/* Normalizes font-size and font-weight to normal */address,caption,cite,code,dfn,em,strong,th,var {
font-size: normal;
font-weight: normal
}/* Removes list-style from lists */table { border-collapse: collapse;
border-spacing: 0
}/* Removes border from fieldset and img */fieldset,img { border: 0
}/* Left-aligns text in caption and th */caption,th {
text-align: left
}/* Removes quotation marks from q */q:before,q:after { content: \'\'
} |
那我们实际写代码的时候该怎么来css reset呢？
我个人推荐使用（和）的 css reset
Eric Meyer\'s Reset:
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td {
margin: 0;
padding: 0;
border: 0;
outline: 0;
font-size: 100%;
vertical-align: baseline;
background: transparent;
}body { line-height: 1;
}ol, ul { list-style: none;
}blockquote, q { quotes: none;
}blockquote:before, blockquote:after, q:before, q:after { content: \'\';
content: none;
}/* remember to define focus styles! */:focus { outline: 0;
}/* remember to highlight inserts somehow! */ins { text-decoration: none;
}del { text-decoration: line-through;
}/* tables still need \'cellspacing="0"\' in the markup */table { border-collapse: collapse;
border-spacing: 0;
} |
YUI:
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,cite,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;
} |
结合他们的css reset写法，再根据自己的实际情况，一定能写出符合自己网站的完美的css reset。