做过web前端开发的都知道，每个标签都自带样式，比如body自带margin，a标签自带下划线，li标签自带小圆点，但是你知道更具体的吗？以下的文档还原了w3c对每个标签最初的定义，收藏一下，对你一定有帮助。

[codesyntax lang=”css”]

@charset "utf-8";
/*@charset "gb2312";*/
/**
 * ============================================================================
 * 版权所有: 切版
 * 网站地址: http://www.qieban.cn
 * 该文件为W3C为标签赋予最原始样式规则、制作参考无实际作用
 * ----------------------------------------------------------------------------
**/

html, address, 
blockquote, 
body, dd, div, 
dl, dt, fieldset, form, 
frame, frameset, 
h1, h2, h3, h4, 
h5, h6, noframes, 
ol, p, ul, center, 
dir, hr, menu, pre   { display: block } 
li              { display: list-item } 
head            { display: none } 
table           { display: table } 
tr              { display: table-row } 
thead           { display: table-header-group } 
tbody           { display: table-row-group } 
tfoot           { display: table-footer-group } 
col             { display: table-column } 
colgroup        { display: table-column-group } 
td, th          { display: table-cell } 
caption         { display: table-caption } 
th              { font-weight: bolder; text-align: center } 
caption         { text-align: center } 
body            { margin: 8px } 
h1              { font-size: 2em; margin: .67em 0 } 
h2              { font-size: 1.5em; margin: .75em 0 } 
h3              { font-size: 1.17em; margin: .83em 0 } 
h4, p, 
blockquote, ul, 
fieldset, form, 
ol, dl, dir, 
menu            { margin: 1.12em 0 } 
h5              { font-size: .83em; margin: 1.5em 0 } 
h6              { font-size: .75em; margin: 1.67em 0 } 
h1, h2, h3, h4, 
h5, h6, b, 
strong          { font-weight: bolder } 
blockquote      { margin-left: 40px; margin-right: 40px } 
i, cite, em, 
var, address    { font-style: italic } 
pre, tt, code, 
kbd, samp       { font-family: monospace } 
pre             { white-space: pre } 
button, textarea, 
input, select   { display: inline-block } 
big             { font-size: 1.17em } 
small, sub, sup { font-size: .83em } 
sub             { vertical-align: sub } 
sup             { vertical-align: super } 
table           { border-spacing: 2px; } 
thead, tbody, 
tfoot           { vertical-align: middle } 
td, th          { vertical-align: inherit } 
s, strike, del  { text-decoration: line-through } 
hr              { border: 1px inset } 
ol, ul, dir, 
menu, dd        { margin-left: 40px } 
ol              { list-style-type: decimal } 
ol ul, ul ol, 
ul ul, ol ol    { margin-top: 0; margin-bottom: 0 } 
u, ins          { text-decoration: underline } 
br:before       { content: "\A" } 
:before, :after { white-space: pre-line } 
center          { text-align: center } 
:link, :visited { text-decoration: underline } 
:focus          { outline: thin dotted invert } 
/* Begin bidirectionality settings (do not change) */ 
BDO[DIR="ltr"]  { direction: ltr; unicode-bidi: bidi-override } 
BDO[DIR="rtl"]  { direction: rtl; unicode-bidi: bidi-override } 
*[DIR="ltr"]    { direction: ltr; unicode-bidi: embed } 
*[DIR="rtl"]    { direction: rtl; unicode-bidi: embed } 
@media print { 
h1            { page-break-before: always } 
h1, h2, h3, 
 h4, h5, h6    { page-break-after: avoid } 
ul, ol, dl    { page-break-before: avoid } 
}

[/codesyntax]

切版，切图网旗下靠谱的web前端外包服务切图客群体。http://www.qieban.cn/

文章为原创或者来自于互联网，转载请注明来源，如果文章有侵权请联系，我们会及时删除。