html教程之HTML元素的默许CSS设置先容

历经多年来的停滞不前，如今全球信息网联盟(WorldWideWebConsortium，W3C)重拾HTML标准化。以下是援用片断：
/**defaultCSSstyle**/
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:.67em0}
h2{font-size:1.5em;margin:.75em0}
h3{font-size:1.17em;margin:.83em0}
h4,p,
blockquote,ul,
fieldset,form,
ol,dl,dir,
menu{margin:1.12em0}
h5{font-size:.83em;margin:1.5em0}
h6{font-size:.75em;margin:1.67em0}
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}
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:1pxinset}
ol,ul,dir,
menu,dd{margin-left:40px}
ol{list-style-type:decimal}
olul,ulol,
ulul,olol{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:thindottedinvert}
/*Beginbidirectionalitysettings(donotchange)*/
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}
@mediaprint{
h1{page-break-before:always}
h1,h2,h3,
h4,h5,h6{page-break-after:avoid}
ul,ol,dl{page-break-before:avoid}
}

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HTML标准自1999年12月发布的HTML4.01后，后继的HTML5和其它标准被束之高阁，为了推动Web标准化运动的发展.