CSS样式重置

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。