HTML4.0元素默认样式想必大家有所不知，本文为了以后使用方便为大家整理了一些，感兴趣的朋友可以参考下，希望对大家有所帮助

代码如下:

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; unicode-bidi: embed }

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 }

}