存一些有用的CSS

reset

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td{margin:0;padding:0}
table{border-collapse:collapse;border-spacing:0}
fieldset,img{border:0}
address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal}
ol,ul{list-style:none}
caption,th{text-align:left}
h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal}
q:before,q:after{content:''}
abbr,acronym{border:0;font-variant:normal}
sup{vertical-align:text-top}
sub{vertical-align:text-bottom}
input,textarea,select{font-family:inherit;font-size:inherit;font-weight:inherit}
input,textarea,select{*font-size:100%}
*{font-family: "Microsoft Yahei"}
a{text-decoration: none;color: #000}

clearfix

.clearfix:after{
    content:".";
    display:block;
    height:0;
    clear:both;
    visibility:hidden
}
.clearfix{
    *+height:1%;
}

css hack

hack	写法	IE6(S)	IE6(Q)	IE7(S)	IE7(Q)	IE8(S)	IE8(Q)	IE9(S)	IE9(Q)	IE10(S)	IE10(Q)
*	*color	Y	Y	Y	Y	N	Y	N	Y	N	Y
+	+color	Y	Y	Y	Y	N	Y	N	Y	N	Y
-	-color	Y	Y	N	N	N	N	N	N	N	N
_	_color	Y	Y	N	Y	N	Y	N	Y	N	N
#	#color	Y	Y	Y	Y	N	Y	N	Y	N	Y
\0	color:red\0	N	N	N	N	Y	N	Y	N	Y	N
\9\0	color:red\9\0	N	N	N	N	N	N	Y	N	Y	N
!important	color:blue !important;color:green;	N	N	Y	N	Y	N	Y	N	Y	Y

*html *前缀只对IE6生效
*+html *+前缀只对IE7生效
@media screen\9{...}只对IE6/7生效
@media \0screen {body { background: red; }}只对IE8有效
@media \0screen\,screen\9{body { background: blue; }}只对IE6/7/8有效
@media screen\0 {body { background: green; }} 只对IE8/9/10有效
@media screen and (min-0\0) {body { background: gray; }} 只对IE9/10有效
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {body { background: orange; }} 只对IE10有效