CSS重置(CSS Reset) 让网页样式在各浏览器中表现一致

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, 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,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}

/*
YUI 3.4.1 (build 4118)
Copyright 2011 Yahoo! Inc. All rights reserved.
Licensed under the BSD License.
http://yuilibrary.com/license/
*/
/*
TODO will need to remove settings on HTML since we can't namespace it.
TODO with the prefix,should I group by selector or property for weight savings?
*/
html {
color:#000;
background:#FFF;
}
/*
TODO remove settings on BODY since we can't namespace it.
*/
/*
TODO test putting a class on HEAD.
- Fails on FF.
*/
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;
}
/*
TODO think about hanlding inheritence differently,maybe letting IE6 fail a bit...
*/
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;
font-variant:normal;
}
/* to preserve line-height and selector appearance */
sup {
vertical-align:text-top;
}
sub {
vertical-align:text-bottom;
}
input,textarea,select {
font-family:inherit;
font-size:inherit;
font-weight:inherit;
}
/*to enable resizing for IE*/
input,textarea,select {
*font-size:100%;
}
/*because legend doesn't inherit in IE */
legend {
color:#000;
}

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, sub, sup, tt, var, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, dialog, figure, header, footer, hgroup, menu, nav, section, time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
outline: 0;
font-weight: inherit;
font-style: inherit;
font-size: 100%;
}
article, aside, nav, section, dialog, figure, header, footer, hgroup {
display:block;
}
legend {
display:none;
}
:focus {
outline: 0;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
caption, th, td {
text-align: left;
font-weight: normal;
}
a img, iframe {
border: none;
}
ul {
list-style: none;
}
input, textarea, select, button {
font-size: 100%;
font-family: inherit;
}
input, select {
vertical-align:middle;
}
select {
margin: inherit;
}
button {
border: 0;
padding: 0;
background: transparent;
cursor: pointer;
}
/* Fixes incorrect placement of numbers in ol's in IE6/7 */
ol { margin-left:2em; }
/* ========================================= clearfix == */
.clearfix:after {
content: ".";
display: block;
height: 0;
clear: both;
visibility: hidden;
}
.clearfix {display: inline-block;}
* html .clearfix {height: 1%;}
.clearfix {display: block;}