不同浏览器对于相同元素的默认样式并不一致，而且不同内核的浏览器在某些控件（元素）的表现上也是各有差异，比如字体、缩进等等，这些问题都是由于浏览器的默认样式（CSS）在作怪，下面西部e网整理了一份浏览器默认css的样式表文件，包括了IE各版本、Firefox、Opera、Webkit等供大家参考：
FireFox 3.6.3浏览器默认CSS样式表
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Blake Ross <BlakeR1234@aol.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
@namespace url(http://www.w3.org/1999/xhtml); /* set default namespace to HTML */
@namespace xul url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
/* bidi */
[dir="rtl"] {
direction: rtl;
unicode-bidi: embed;
}
[dir="ltr"] {
direction: ltr;
unicode-bidi: embed;
}
bdo[dir] {
unicode-bidi: bidi-override;
}
/* To ensure http://www.w3.org/TR/REC-html40/struct/dirlang.html#style-bidi:
*
* "When a block element that does not have a dir attribute is transformed to
* the style of an inline element by a style sheet, the resulting presentation
* should be equivalent, in terms of bidirectional formatting, to the
* formatting obtained by explicitly adding a dir attribute (assigned the
* inherited value) to the transformed element." */
address, blockquote, body, caption, center, col, colgroup, dd, dir, div, dl, dt,
fieldset, form, h1, h2, h3, h4, h5, h6, hr, html, isindex, li, listing, map,
marquee, menu, noframes, ol, p, plaintext, pre, table, tbody, td, tfoot, th,
thead, tr, ul, xmp {
unicode-bidi: embed;
}
/* blocks */
html, div, map, dt, isindex, form {
display: block;
}
body {
display: block;
margin: 8px;
}
p, dl, multicol {
display: block;
margin: 1em 0;
}
dd {
display: block;
-moz-margin-start: 40px;
}
blockquote {
display: block;
margin: 1em 40px;
}
address {
display: block;
font-style: italic;
}
center {
display: block;
text-align: -moz-center;
}
blockquote[type=cite] {
display: block;
margin: 1em 0px;
-moz-padding-start: 1em;
-moz-border-start: solid;
border-color: blue;
border-width: thin;
}
span[_moz_quote=true] {
color: blue;
}
pre[_moz_quote=true] {
color: blue;
}
h1 {
display: block;
font-size: 2em;
font-weight: bold;
margin: .67em 0;
}
h2 {
display: block;
font-size: 1.5em;
font-weight: bold;
margin: .83em 0;
}
h3 {
display: block;
font-size: 1.17em;
font-weight: bold;
margin: 1em 0;
}
h4 {
display: block;
font-weight: bold;
margin: 1.33em 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;
}
listing {
display: block;
font-family: -moz-fixed;
font-size: medium;
white-space: pre;
margin: 1em 0;
}
xmp, pre, plaintext {
display: block;
font-family: -moz-fixed;
white-space: pre;
margin: 1em 0;
}
/* tables */
table {
display: table;
border-spacing: 2px;
border-collapse: separate;
margin-top: 0;
margin-bottom: 0;
/* XXXldb do we want this if we're border-collapse:collapse ? */
-moz-box-sizing: border-box;
text-indent: 0;
}
table[align="left"] {
float: left;
}
table[align="right"] {
float: right;
text-align: start;
}
table[rules]:not([rules="none"]) {
border-collapse: collapse;
}
/* caption inherits from table not table-outer */
caption {
display: table-caption;
text-align: center;
-moz-box-sizing: border-box;
}
table[align="center"] > caption {
margin-left: auto;
margin-right: auto;
}
table[align="center"] > caption[align="left"] {
margin-right: 0;
}
table[align="center"] > caption[align="right"] {
margin-left: 0;
}
tr {
display: table-row;
vertical-align: inherit;
}
col {
display: table-column;
}
colgroup {
display: table-column-group;
}
tbody {
display: table-row-group;
vertical-align: middle;
}
thead {
display: table-header-group;
vertical-align: middle;
}
tfoot {
display: table-footer-group;
vertical-align: middle;
}
/* for XHTML tables without tbody */
table > tr {
vertical-align: middle;
}
td {
display: table-cell;
vertical-align: inherit;
text-align: inherit;
padding: 1px;
}
th {
display: table-cell;
vertical-align: inherit;
font-weight: bold;
padding: 1px;
}
tr > form:-moz-is-html, tbody > form:-moz-is-html,
thead > form:-moz-is-html, tfoot > form:-moz-is-html,
table > form:-moz-is-html {
/* Important: don't show these forms in HTML */
display: none !important;
}
/* inlines */
q:before {
content: open-quote;
}
q:after {
content: close-quote;
}
b, strong {
font-weight: bolder;
}
i, cite, em, var, dfn {
font-style: italic;
}
tt, code, kbd, samp {
font-family: -moz-fixed;
}
u, ins {
text-decoration: underline;
}
s, strike, del {
text-decoration: line-through;
}
blink {
text-decoration: blink;
}
big {
font-size: larger;
}
small {
font-size: smaller;
}
sub {
vertical-align: sub;
font-size: smaller;
line-height: normal;
}
sup {
vertical-align: super;
font-size: smaller;
line-height: normal;
}
nobr {
white-space: nowrap;
}
/* titles */
abbr[title], acronym[title] {
border-bottom: dotted 1px;
}
/* lists */
ul, menu, dir {
display: block;
list-style-type: disc;
margin: 1em 0;
-moz-padding-start: 40px;
}
ol {
display: block;
list-style-type: decimal;
margin: 1em 0;
-moz-padding-start: 40px;
}
li {
display: list-item;
}
/* nested lists have no top/bottom margins */
ul ul, ul ol, ul dir, ul menu, ul dl,
ol ul, ol ol, ol dir, ol menu, ol dl,
dir ul, dir ol, dir dir, dir menu, dir dl,
menu ul, menu ol, menu dir, menu menu, menu dl,
dl ul, dl ol, dl dir, dl menu, dl dl {
margin-top: 0;
margin-bottom: 0;
}
/* 2 deep unordered lists use a circle */
ol ul, ul ul, menu ul, dir ul,
ol menu, ul menu, menu menu, dir menu,
ol dir, ul dir, menu dir, dir dir {
list-style-type: circle;
}
/* 3 deep (or more) unordered lists use a square */
ol ol ul, ol ul ul, ol menu ul, ol dir ul,
ol ol menu, ol ul menu, ol menu menu, ol dir menu,
ol ol dir, ol ul dir, ol menu dir, ol dir dir,
ul ol ul, ul ul ul, ul menu ul, ul dir ul,
ul ol menu, ul ul menu, ul menu menu, ul dir menu,
ul ol dir, ul ul dir, ul menu dir, ul dir dir,
menu ol ul, menu ul ul, menu menu ul, menu dir ul,
menu ol menu, menu ul menu, menu menu menu, menu dir menu,
menu ol dir, menu ul dir, menu menu dir, menu dir dir,
dir ol ul, dir ul ul, dir menu ul, dir dir ul,
dir ol menu, dir ul menu, dir menu menu, dir dir menu,
dir ol dir, dir ul dir, dir menu dir, dir dir dir {
list-style-type: square;
}
/* leafs */
/*
noshade and color attributes are handled completely by
* the nsHTMLHRElement attribute mapping code
*/
hr {
display: block;
height: 2px;
border: 1px inset;
margin: 0.5em auto 0.5em auto;
color: gray;
-moz-float-edge: margin-box;
-moz-box-sizing: border-box;
}
hr[size="1"] {
border-style: solid none none none;
}
*|*:-moz-any-link img, img[usemap], object[usemap] {
border: 2px solid;
}
img:-moz-broken::before, input:-moz-broken::before,
img:-moz-user-disabled::before, input:-moz-user-disabled::before,
img:-moz-loading::before, input:-moz-loading::before,
applet:-moz-empty-except-children-with-localname(param):-moz-broken::before,
applet:-moz-empty-except-children-with-localname(param):-moz-user-disabled::before {
content: -moz-alt-content !important;
unicode-bidi: embed;
}
object:-moz-broken > *|*, applet:-moz-broken > *|*
object:-moz-user-disabled > *|*, applet:-moz-user-disabled > *|* {
/*
Inherit in the object's alignment so that if we aren't aligned explicitly
we'll end up in the right place vertically. See bug 36997. Note that this
is not !important because we _might_ be aligned explicitly.
*/
vertical-align: inherit;
}
img:-moz-suppressed, input:-moz-suppressed, object:-moz-suppressed,
embed:-moz-suppressed, applet:-moz-suppressed {
/*
Set visibility too in case the page changes display. Note that we _may_
want to just set visibility and not display, in general, if we find that
display:none breaks too many layouts. And if we decide we really do want
people to be able to right-click blocked images, etc, we need to set
neither one, and hack the painting code.... :(
*/
display: none !important;
visibility: hidden !important;
}
img[usemap], object[usemap] {
color: blue;
}
frameset {
display: block ! important;
overflow: -moz-hidden-unscrollable;
position: static ! important;
float: none ! important;
border: none ! important;
}
frame {
border: none ! important;
}
iframe {
border: 2px inset;
}
noframes {
display: none;
}
spacer {
position: static ! important;
float: none ! important;
}
canvas {
-moz-user-select: none;
}
/* focusable content: anything w/ tabindex >=0 is focusable */
abbr:focus, acronym:focus, address:focus, b:focus,
base:focus, big:focus, blockquote:focus, br:focus, canvas:focus, caption:focus,
center:focus, cite:focus, code:focus, col:focus, colgroup:focus, dd:focus,
del:focus, dfn:focus, dir:focus, div:focus, dl:focus, dt:focus, em:focus,
fieldset:focus, font:focus, form:focus, h1:focus, h2:focus, h3:focus, h4:focus,
h5:focus, h6:focus, hr:focus, i:focus, img:focus, ins:focus,
kbd:focus, label:focus, legend:focus, li:focus, link:focus, menu:focus,
ol:focus, p:focus, pre:focus, q:focus, s:focus, samp:focus,
small:focus, span:focus, strike:focus, strong:focus, sub:focus, sup:focus,
table:focus, tbody:focus, td:focus, tfoot:focus, th:focus, thead:focus,
tr:focus, tt:focus, u:focus, ul:focus, var:focus {
/* Don't specify the outline-color, we should always use initial value. */
outline: 1px dotted;
}
/* hidden elements */
area, base, basefont, head, meta, script, style, title,
noembed, param {
display: none;
}
/* media elements */
video > xul|videocontrols, audio > xul|videocontrols {
display: -moz-box;
-moz-box-orient: vertical;
-moz-binding: url("chrome://global/content/bindings/videocontrols.xml#videoControls");
}
video:not([controls]) > xul|videocontrols,
audio:not([controls]) > xul|videocontrols {
visibility: hidden;
}
audio:not([controls]) {
display: none;
}
/* emulation of non-standard HTML