不同瀏覽器對于相同元素的默認樣式并不一致，而且不同內核的瀏覽器在某些控件（元素）的表現上也是各有差異，比如字體、縮進等等，這些問題都是由于瀏覽器的默認樣式（CSS）在作怪，下面西部e網整理了一份瀏覽器默認css的樣式表文件，包括了IE各版本、Firefox、Opera、Webkit等供大家參考：

Opera 10.51瀏覽器默認CSS樣式表

/* Copyright 2010 Opera Software */

a {
 color: #00C;
 text-decoration: underline;
}

a:visited {
 color: #800080;
}

abbr {
 border-bottom-style: dotted;
 border-bottom-width: 1px;
}

address {
 display: block;
 font-style: italic;
 padding-left: 2px;
 padding-right: 2px;
}

area {
 display: none;
}

audio {
 display: none;
}

audio[controls] {
 display: inline;
}

b {
 font-weight: bold;
}

base {
 display: none;
}

bdo {
 direction: rtl;
 unicode-bidi: bidi-override;
}

blockquote {
 display: block;
 margin: 1em 10px 1em 40px;
}

[dir=rtl] blockquote {
 margin: 1em 10px 1em 40px;
}

body {
 display: block;
 margin: 8px;
}

button {
 border-width: 2px;
 color: #000;
 display: inline-block;
 font-family: use-lang-def;
 font-size: 13px;
 font-weight: 400;
 padding: 1px 8px;
 text-align: center;
 text-indent: 0;
 white-space: nowrap;
}

caption {
 display: table-caption;
 text-align: center;
}

cite {
 font-style: italic;
}

code {
 font-family: use-lang-def;
 font-size: 0.81em;
}

col {
 display: table-column;
}

colgroup {
 display: table-column-group;
}

datalist {
 display: none;
}

dd {
 margin: 0 0 0 40px;
}

[dir=rtl] dd {
 margin: 0 40px 0 0;
}

del {
 text-decoration: line-through;
}

dfn {
 font-style: italic;
}

div {
 display: block;
}

dl {
 display: block;
 margin: 1em 0;
}

dt {
 display: block;
}

em {
 font-style: italic;
}

fieldset {
 border-style: groove;
 border-width: 2px;
 display: block;
 margin-left: 2px;
 margin-right: 2px;
 padding: 0.33em 0.67em 0.75em;
}

form {
 display: block;
}

h1 {
 display: block;
 font-size: 2em;
 font-weight: bold;
 margin: 0.67em 0;
}

h2 {
 display: block;
 font-size: 1.5em;
 font-weight: bold;
 margin: 0.83em 0;
}

h3 {
 display: block;
 font-size: 1.17em;
 font-weight: bold;
 margin: 1em 0;
}

h4 {
 display: block;
 font-weight: bold;
 margin: 1em 0;
}

h5 {
 display: block;
 font-size: 0.83em;
 font-weight: bold;
 margin: 1.67em 0;
}

h6 {
 display: block;
 font-size: 0.67em;
 font-weight: bold;
 margin: 2.33em 0;
}

head {
 display: none;
}

hr {
 border-style: inset;
 border-width: 1px;
 box-sizing: content-box;
 display: block;
 height: 0;
 margin: 10px 0;
 text-align: center;
}

html {
 display: block;
}

i {
 font-style: italic;
}

iframe {
 border-style: inset;
 border-width: 2px;
}

input {
 border-width: 2px;
 color: #000;
 font-family: use-lang-def;
 font-size: 13px;
 font-weight: 400;
 padding: 1px;
 text-align: default;
 text-indent: 0;
 text-transform: none;
}

ins {
 text-decoration: underline;
}

kbd {
 font-family: use-lang-def;
 font-size: 0.81em;
}

keygen {
 border-width: 2px;
 color: #000;
 font-family: use-lang-def;
 font-size: 13px;
 font-weight: 400;
 padding: 1px;
 text-align: default;
 text-indent: 0;
}

legend {
 display: block;
 padding-left: 2px;
 padding-right: 2px;
}

li {
 display: list-item;
}

link {
 display: none;
}

menu {
 display: block;
 margin: 1em 0 1em 40px;
 padding-left: 2px;
 padding-right: 2px;
}

[dir=rtl] menu {
 margin: 1em 40px 1em 0;
}

meta {
 display: none;
}

noscript {
 display: none;
}

ol {
 padding: 0 40px 0 0;
}

optgroup {
 text-indent: 0;
}

option {
 text-indent: 0;
}

p {
 display: block;
 margin: 1em 0;
}

pre {
 display: block;
 font-family: use-lang-def;
 font-size: 0.81em;
 margin: 1em 0;
 white-space: pre;
}

q {
 quotes: "\"" "\"" "'" "'";
}

samp {
 font-family: use-lang-def;
 font-size: 0.81em;
}

script {
 display: none;
}

select {
 border-width: 2px;
 color: #000;
 font-family: use-lang-def;
 font-size: 13px;
 font-weight: 400;
 padding: 1px;
 text-align: default;
 text-indent: 0;
}

strong {
 font-weight: bold;
}

style {
 display: none;
}

sub {
 vertical-align: sub;
}

sup {
 vertical-align: super;
}

table {
 border-spacing: 2px;
 display: table;
 text-indent: 0;
}

tbody {
 display: table-row-group;
 vertical-align: middle;
}

td {
 display: table-cell;
 padding: 1px;
 vertical-align: inherit;
}

textarea {
 border-width: 2px;
 color: #000;
 font-family: use-lang-def;
 font-size: 13px;
 font-weight: 400;
 line-height: normal;
 padding: 1px;
 text-align: default;
 text-indent: 0;
 text-transform: none;
}

tfoot {
 display: table-footer-group;
 vertical-align: middle;
}

th {
 display: table-cell;
 font-weight: bold;
 padding: 1px;
 vertical-align: inherit;
}

thead {
 display: table-header-group;
 vertical-align: middle;
}

title {
 display: none;
}

tr {
 display: table-row;
 vertical-align: inherit;
}

ul {
 display: block;
 list-style-position: outside;
 list-style-type: disc;
 margin: 1em 0;
 padding: 0 0 0 40px;
}

[dir=rtl] ul {
 padding: 0 40px 0 0;
}

var {
 font-style: italic;
}

video {
 display: inline;
}