css如何重设浏览器默认样式

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代码如下:

@charset "utf-8";


html {
color:black;
background:white;
}

body,div,dl,dt,dd,ul,ol,li,h2,h3,h4,h5,h6,h7,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section {
margin:0;
padding:0;
}

body,button,input,select,textarea {
font:12px SimSun,tahoma,arial,sans-serif;
}
input,select,textarea {
font-size:100%;
}

table {
border-collapse:collapse;
border-spacing:0;
}

th {
text-align:inherit;
}

fieldset,img {
border:none;
}

iframe {
display:block;
}

abbr,acronym {
border:none;
font-variant:normal;
}

del {
text-decoration:line-through;
}
address,caption,cite,code,dfn,em,th,var {
font-style:normal;
font-weight:500;
}

ol,ul {
list-style:none;
}

caption,th {
text-align:left;
}

h2,h3,h4,h5,h6,h7 {
font-size:100%;
font-weight:500;
}
q:before,q:after {
content:'';
}

sub, sup {
font-size:75%;
line-height:0;
position:relative;
vertical-align:baseline;
}
sup {
top:-0.5em;
}
sub {
bottom:-0.25em;
}

a:hover {
text-decoration:underline;
}

ins,a {
text-decoration:none;
}

a:focus,*:focus {
outline:none;
}

.clearfix:before,.clearfix:after {
content:"";
display:table;
}
.clearfix:after {
clear:both;
overflow:hidden;
}
.clearfix {
zoom:1;
}
.clear{
clear:both;
display:block;
overflow:hidden;
height:0;
line-height:0;
font-size:0;
}

.hide {
display:none !important;
visibility:hidden;
}
.block {
display:block !important;
}

.fl {
float:left;
display:inline;
}
.fr {
float:right;
display:inline;
}

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