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, tr { 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"; 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 }
}

[轉載]Appendix D. Default style sheet for HTML 4

</END>

　　如何实现javascript精确获取元素css属性值？当处理 DOM 元素的 CSS 属性时，我们经常会遇到一个问题：明明页面上已经定义了 CSS 属性值，但在获取的时候却为空，这是因为任何样式表文件或内联 CSS 预设的样式信息并不能可靠地反映到 style 属性上，本文向你介绍准确获取指定元素 CSS 属性值的方法。

Javascript:
<script type="text/javascript">
function getStyle( elem, name )
{
??? //如果该属性存在于style[]中，则它最近被设置过(且就是当前的)
??? if (elem.style[name])
??? {
??????? return elem.style[name];
??? }
??? //否则，尝试IE的方式
??? else if (elem.currentStyle)
??? {
??????? return elem.currentStyle[name];
??? }
??? //或者W3C的方法，如果存在的话
??? else if (document.defaultView && document.defaultView.getComputedStyle)
??? {
??????? //它使用传统的"text-Align"风格的规则书写方式，而不是"textAlign"
??????? name = name.replace(/([A-Z])/g,"-$1");
??????? name = name.toLowerCase();
??????? //获取style对象并取得属性的值(如果存在的话)
??????? var s = document.defaultView.getComputedStyle(elem,"");
??????? return s && s.getPropertyValue(name);
??? //否则，就是在使用其它的浏览器
??? }
??? else
??? {
??????? return null;
??? }
}
</script>

[轉載]http://www.chinaz.com/Design/Rules/0122640202009.html