HTML4默认层叠样式表

摘自：http://www.w3.org/TR/CSS21/sample.html

这个默认的样式表是针对CSS2.1

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
}
/*以上均为块状显示，未列出为内联元素显示，部分元素在XHTML1中将废弃*/
li {
	display: list-item
}/*默认以列表显示*/
head {
	display: none
}/*默认不显示*/
table {
	display: table
}/*默认为表格显示*/
tr {
	display: table-row
}/*默认为表格行显示*/
thead {
	display: table-header-group
}/*默认为表格头部分组显示*/
tbody {
	display: table-row-group
}/*默认为表格行分组显示*/
tfoot {
	display: table-footer-group
}/*默认为表格底部分组显示*/
col {
	display: table-column
}/*默认为表格列显示*/
colgroup {
	display: table-column-group
}/*默认为表格列分组显示*/
td, th {
	display: table-cell;
}/*默认为单元格显示*/
caption {
	display: table-caption
}/*默认为表格标题显示*/
th {
	font-weight: bolder;
	text-align: center
}
/*默认为表格标题显示，呈现加粗居中状态*/
caption {
	text-align: center
}/*默认为表格标题显示，呈现居中状态*/
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, 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, object, select {
	display:inline-block;
}
big {
	font-size: 1.17em
}
small, sub, sup {
	font-size: .83em
}
sub {
	vertical-align: sub
}/*定义sub元素默认为下标显示*/
sup {
	vertical-align: super
}/*定义sub元素默认为上标显示*/
table {
	border-spacing: 2px;
}
thead, tbody, tfoot {
	vertical-align: middle
}
/*定义表头、主体表、表脚元素默认为垂直对齐*/
td, th {
	vertical-align: inherit
}
/*定义单元格、列标题默认为垂直对齐默认为继承*/
s, strike, del {
	text-decoration: line-through
}
/*定义这些元素默认为删除线显示*/
hr {
	border: 1px inset
}/*定义分割线默认为1px宽的3D凹边效果*/
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"
}/*定义换行元素的伪对象内容样式*/
:before, :after {
	white-space: pre-line
}/*定义伪对象空格字符的默认样式*/
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
}
/*定义BDO元素当其属性为DIR="ltr"时的默认文本读写显示顺序*/
BDO[DIR="rtl"] {
	direction: rtl;
	unicode-bidi: bidi-override
}
/*定义BDO元素当其属性为DIR="rtl"时的默认文本读写显示顺序*/
*[DIR="ltr"] {
	direction: ltr;
	unicode-bidi: embed
}
/*定义任何元素当其属性为DIR="ltr"时的默认文本读写显示顺序*/
*[DIR="rtl"] {
	direction: rtl;
	unicode-bidi: embed
}
/*定义任何元素当其属性为DIR="rtl"时的默认文本读写显示顺序*/
@media print { /*定义标题和列表默认的打印样式*/
h1 {
	page-break-before: always
}
h1, h2, h3, h4, h5, h6 {
	page-break-after: avoid
}
ul, ol, dl {
	page-break-before: avoid
}
}