文档HTML默认,参考文档：浏览器默认HTML的CSS样式属性

这个“浏览器默认HTML的CSS样式属性”，在你需要还原默认值的时候，比较有用。开始的时候应用通配选择器 *{margin:0;padding:0;}，当需要使用边距的时候，就需要还原HTML默认CSS值了。

以前一直在找这份文档，今天偶然在w3上看到了。除了inline和block的定义，主要是要注意body|h1~h6|blockquote|menu|ul|ol|dd等标签的默认样式(margin和font-size)。代码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; line-height: 1.12 }

h1 { font-size: 2em; margin: .67em 0 }

h2 { font-size: 1.5em; margin: .75em 0 }

h3 { font-size: 1.17em; margin: .83em 0 }

h4,

fieldset,dl,dir,

menu { margin: 1.12em 0 }

h5 { font-size: .83em; margin: 1.5em 0 }

h6 { font-size: .75em; margin: 1.67em 0 }

h1,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,object,

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,

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 }

abbr,acronym { font-variant: small-caps; letter-spacing: 0.1em }

: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,

h4,h5,h6 { page-break-after: avoid }

ul,ol,dl { page-break-before: avoid }