腾讯
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body,ol,ul,h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 ,p,th,td,dl,dd,form,fieldset,legend,input,textarea,select{ margin : 0 ; padding : 0 }
body{ font : 12px "宋体" , "Arial Narrow" ,HELVETICA; background : #fff ;-webkit-text-size-adjust: 100% }
a{ color : #172c45 ; text-decoration : none }
a:hover{ color : #cd0200 ; text-decoration : underline }
em{ font-style : normal }
li{ list-style : none }
img{ border : 0 ; vertical-align : middle }
table{ border-collapse : collapse ; border-spacing : 0 }
p{word-wrap:break-word}
百度
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body,h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 ,hr,p,blockquote,dl,dt,dd,ul,ol,li, pre ,form,fieldset,legend,button,input,textarea,th,td{ margin : 0 ; padding : 0 }
html{ color : #000 ;overflow-y: scroll ; overflow :-moz-scrollbars-vertical}
body,button,input,select,textarea{ font-size : 12px ; font-family : arial , 'Hiragino Sans GB' , 'Microsoft Yahei' , '微软雅黑' , '宋体' ,\ 5 b 8 b\ 4 f 53 , Tahoma , Arial , Helvetica ,STHeiti}
h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 { font-size : 100% }
em{ font-style : normal }
small { font-size : 12px }
ul,ol{ list-style : none }
a{ text-decoration : none }
a:hover{ text-decoration : underline }
legend{ color : #000 }
fieldset,img{ border : 0 }
button,input,select,textarea{ font-size : 100% }
table{ border-collapse : collapse ; border-spacing : 0 }
img{-ms-interpolation-mode:bicubic}
textarea{resize:vertical}
. left { float : left }
. right { float : right }
.overflow{ overflow : hidden }
. hide { display : none }
. block { display : block }
. inline { display : inline }
.error{ color : #F00 ; font-size : 12px }
label,button{ cursor : pointer }
.clearfix:after{ content : '\20' ; display : block ; height : 0 ; clear : both }
.clearfix{zoom: 1 }.clear{ clear : both ; height : 0 ; line-height : 0 ; font-size : 0 ; visibility : hidden ; overflow : hidden }
.wordwrap{word-break:break- all ;word-wrap:break-word}
pre .wordwrap{ white-space :pre-wrap}
body{ text-align : center }
body,form{ position : relative }
td{ text-align : left }
img{ border : 0 }
新浪
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/* 初始化CSS */
html, body, ul, li, ol, dl, dd, dt, p, h 1 , h 2 , h 3 , h 4 , h 5 , h 6 , form, fieldset, legend, img { margin : 0 ; padding : 0 ; }
fieldset, img { border : none ; }
img{ display : block ;}
address, caption , cite, code , dfn, th, var { font-style : normal ; font-weight : normal ; }
ul, ol { list-style : none ; }
input { padding-top : 0 ; padding-bottom : 0 ; font-family : "SimSun" , "宋体" ;}
input::-moz-focus-inner { border : none ; padding : 0 ; }
select, input { vertical-align : middle ; }
select, input, textarea { font-size : 12px ; margin : 0 ; }
input[type= "text" ], input[type= "password" ], textarea { outline-style : none ; -webkit-appearance: none ; }
textarea { resize: none ; }
table { border-collapse : collapse ; }
body { color : #333 ; padding : 5px 0 ; font : 12px / 20px "SimSun" , "宋体" , "Arial Narrow" ,HELVETICA; background : #fff ; /* overflow-y:scroll;*/ }
.clearfix:after { content : "." ; display : block ; height : 0 ; visibility : hidden ; clear : both ; }
.clearfix { zoom: 1 ; }
.clearit { clear : both ; height : 0 ; font-size : 0 ; overflow : hidden ; }
a { color : #666 ; text-decoration : none ; }
a:visited { color : #666 ; }
a:hover, a:active, a:focus { color : #ff8400 ; text-decoration : underline ; }
淘宝
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body, h 1 , h 2 , h 3 , h 4 , h 5 , h 6 , hr, p, blockquote, dl, dt, dd, ul, ol, li, pre , form, fieldset, legend, button, input, textarea, th, td { margin : 0 ; padding : 0 ; }
body, button, input, select, textarea { font : 12px / 1.5 tahoma, arial , \ 5 b 8 b\ 4 f 53 ; }
h 1 , h 2 , h 3 , h 4 , h 5 , h 6 { font-size : 100% ; }
address, cite, dfn, em, var { font-style : normal ; }
code , kbd, pre , samp { font-family :couriernew, courier , monospace ; }
small { font-size : 12px ; }
ul, ol { list-style : none ; }
a { text-decoration : none ; }
a:hover { text-decoration : underline ; }
sup { vertical-align : text-top ; }
sub { vertical-align : text-bottom ; }
legend { color : #000 ; }
fieldset, img { border : 0 ; }
button, input, select, textarea { font-size : 100% ; }
table { border-collapse : collapse ; border-spacing : 0 ; }
网易
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html {overflow-y: scroll ;}
body { margin : 0 ; padding : 0 ; font : 12px / 1.5 \ 5 b 8 b\ 4 f 53 , Arial , sans-serif ; /*background:#ffffff;*/ }
div,dl,dt,dd,ul,ol,li,h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 , pre ,form,fieldset,input,textarea,blockquote,p{ padding : 0 ; margin : 0 ;}
table,td,tr,th{ font-size : 12px ;}
ol,ul { list-style : none ;}
li{ list-style-type : none ;}
img{ vertical-align : top ; border : 0 ;}
h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 { font-size :inherit; font-weight : normal ;}
address,cite, code ,em,th,i{ font-weight : normal ; font-style : normal ;}
.hx a,.hx em,.fB{ font-weight : bold ;}
.clearfix{*zoom: 1 ;}
.clearfix:after{ display : block ; overflow : hidden ; clear : both ; height : 0 ; visibility : hidden ; content : "." ;}
a { color : #252525 ; text-decoration : none ;}
a:visited { text-decoration : none ;}
a:hover { color : #ba2636 ; text-decoration : underline ;}
a:active { color : #ba2636 ;}
搜狐
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/* 全局CSS定义 */
body{ font-family : "\5B8B\4F53" , "Arial Narrow" ,HELVETICA; text-align : center ; margin : 0 auto ; padding : 0 ; background : #FFF ; font-size : 12px ; color : #333 ;}
body > div{ text-align : center ; margin-right : auto ; margin-left : auto ;}
div,form,ul,ol,li,span,p{ margin : 0 ; padding : 0 ; border : 0 ;}
img,a img{ border : 0 ; margin : 0 ; padding : 0 ;}
h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 { margin : 0 ; padding : 0 ; font-size : 12px ; font-weight : normal ;}
ul,ol,li{ list-style : none }
table,td,input{ font-size : 12px ; padding : 0 }
/* 默认链接颜色 */
a{ outline-style : none ; color : #333 ; text-decoration : none }
a:hover{ color : #c00 ; text-decoration : underline ;}
/*清除链接虚框*/
/*a,area {blr:expression(this.onFocus=this.blur()) } for IE
:focus {-moz-outline-style: none; } for Firefox
*/
优酷
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@charset "utf-8" ;
article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{ display : block }
audio,canvas,video{ display :inline- block ;* display : inline ;*zoom: 1 }
audio:not([controls]){ display : none }
html{-webkit-text-size-adjust: 100% ;-ms-text-size-adjust: 100% }
a:focus{ outline : thin dotted #333 ; outline : 5px auto -webkit-focus-ring-color;outline-offset: -2px }
a:hover,a:active{ outline : 0 }
figure{ padding : 0 ; margin : 0 }
sub ,sup{ position : relative ; font-size : 75% ; line-height : 0 ; vertical-align : baseline }
sup{ top : -0.5em }
sub { bottom : -0.25em }
img{ vertical-align : middle ; border : 0 ;-ms-interpolation-mode:bicubic}
button,input,select,textarea{ margin : 0 ; font-size : 100% ; vertical-align : middle }
button,input{* overflow : visible ; line-height : normal }
button::-moz-focus-inner,input::-moz-focus-inner{ padding : 0 ; border : 0 }
button,input[type= "button" ],input[type= "reset" ],input[type= "submit" ]{-webkit-appearance:button; cursor : pointer }
input[type= "search" ]{-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box;-webkit-appearance:textfield}
input[type= "search" ]::-webkit-search-decoration,input[type= "search" ]::-webkit-search-cancel-button{-webkit-appearance: none }
textarea{ overflow : auto ; vertical-align : top }
ol,ul,dl{ list-style : none }
body,p,ol,ul,dl{ padding : 0 ; margin : 0 }
a:link,a:visited{ text-decoration : none ; color : #555 }
a:hover{ color : #c31 }
a. white { color : #fff }
a. blue { color : #3399e0 }
美团
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blockquote,body, code ,dd,div,dl,dt,fieldset,form,h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 ,input,legend,li,ol,p, pre ,td,textarea,th,ul{ margin : 0 ; padding : 0 }
table{ border-collapse : collapse ; border-spacing : 0 }
fieldset,img{ border : 0 }
address, caption ,cite, code ,dfn,em,var{ font-style : normal ; font-weight : 400 }
li{ list-style : none }
caption ,th{ text-align : left }
h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 { font-size : 100% }
q:after,q:before{ content : '' }
abbr,acronym{ border : 0 ; font-variant : normal }
sup{ vertical-align : text-top }
sub { vertical-align : text-bottom }
input,select,textarea{ font-family :inherit; font-size :inherit;* font-size : 100% ; font-weight :inherit}
legend{ color : #333 }html{ background-color : #eee }
body{ font : 400 14px / 1.5 "Hiragino Sans GB" , "WenQuanYi Micro Hei" , tahoma , sans-serif ; color : #666 ; background-color : #fff }
a{ color : #2bb8aa ; text-decoration : none }a:hover{ text-decoration : underline }
h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 { font-family : "Hiragino Sans GB" , " Microsoft YaHei" , "WenQuanYi Micro Hei" , arial , sans-serif ; color : #333 ;-webkit-font-smoothing:antialiased}
input[type=password]{ font-family : arial , sans-serif }
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@charset "utf-8" ;
/* =reset 网页样式重置
html { font-size:1em;-webkit-tap-highlight-color:rgba(0,0,0,0); -webkit-tap-highlight:rgba(0,0,0,0);-webkit-text-size-adjust:none;overflow:-moz-scrollbars-vertical;/*强制firefox出现滑动条*/ }
body { font-size : 0.75em ;}
label { cursor : pointer ;}
a:link, a:visited { text-decoration : none ;}
input:focus { outline : none ; }
input,button,select,textarea{ outline : none ; /*-webkit-appearance:none;*/ /*强制去除表单自带的样式*/ }
textarea{resize: none ; /*-webkit-appearance:none;*/ /*强制去除textarea自带的样式*/ }
input:-webkit-autofill { -webkit-box-shadow: 0 0 0px 1000px white inset ; } /*利用阴影来填充掉input自动填充色*/
textarea,input,select { background : none ; border : none ; margin : 0 ; padding : 0 ; }
a, abbr, acronym, address, applet, article, aside, audio, b, blockquote, big, body, center , canvas, caption , cite, code , command, datalist, dd, del, details, dfn, dl, div, dt, em, embed , fieldset, figcaption, figure, font, footer, form, h 1 , h 2 , h 3 , h 4 , h 5 , h 6 , header, hgroup, html, i, iframe, img, ins, kbd, keygen, label, legend, li, meter, nav, menu, object, ol, output, p, pre , progress, q, s, samp, section, small , span, source, strike, strong, sub , sup, table, tbody, tfoot, thead, th, tr, tdvideo, tt,u, ul, var { margin : 0 ; padding : 0 ;}
article, aside, footer, header, hgroup, nav, section, figure, figcaption { display : block ;} /*html5设置*/
h 1 , h 2 , h 3 , h 4 , h 5 , h 6 , th, td, table, input, button, select, textarea, sub { font-size : 1em ;}
body, input, button, select, textarea, sub { font-family : Arial , sans-serif ;}
em, cite, address, optgroup { font-style : normal ;}
kbd, samp, code { font-family : monospace ;}
img, input, button, select, textarea { vertical-align : middle ; outline : none ;}
ul, ol { list-style : none ;}
img, fieldset { border : 0 ;}
abbr, acronym { cursor : help ; border-bottom : 1px dotted black ;}
table { width : 100% ; border-spacing : 0 ; border : 0 ;}
table th, table td { border : 0 ;}
legend, hr { overflow : hidden ; position : absolute ; top : 0 ; left : 0 ;}
legend, hr, caption { visibility : hidden ; font-size : 0 ; width : 0 ; height : 0 ; line-height : 0 ;}
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html{ height : 100% ;-webkit-text-size-adjust: 100% ;-ms-text-size-adjust: 100% ;-webkit-font-smoothing:antialiased;}
body{ margin : 0 ; padding : 0 ; background-color : #fff ; min-height : 100% ; height : auto !important ; height : 100% ; text-align : center ; color : #404040 ; font : 12px / 1.5 Helvetica , arial ;}
h 1 ,h 2 ,h 3 ,h 4 ,h 5 ,h 6 ,p,figure,form{ margin : 0 ;}
table{ border-collapse : collapse ; border-spacing : 0 ;}
img{ border : 0 ; vertical-align : middle ;-ms-interpolation-mode: bicubic;}
a{ text-decoration : none ; color : #29B4F0 ;}
a:focus { outline : thin dotted ;}
a:hover{ color : #017CB9 ; text-decoration : underline ;}
/* hn */
h 1 { font-size : 16px ; line-height : 36px ;}
h 2 { font-size : 14px ; line-height : 30px ;}
h 3 { line-height : 24px ;}
h 3 ,h 4 ,h 5 ,h 6 { font-size : 12px ;}
/* ul ol dl */
ul,li,ol{ margin : 0 ; padding : 0 ; list-style : none outside none ;}
ul.has-style li,ol li{ margin-left : 25px ;}
ul.has-style li{ list-style : disc ;}
ol li{ list-style : decimal ;}
ul.inline-style li{ float : left ; display : inline ;}
dl{ margin-bottom : 18px ;}
dt{ font-weight : bold ;}
dd{ margin : 0 0 0 9px ; padding : 0 ;}
svg:not(:root) { overflow : hidden ;}
/* clearfix */
.clearfix:before, .clearfix:after { content : "" ; display :table;}
.clearfix:after{ clear : both ; overflow : hidden ;}
.clearfix{zoom: 1 ;}
来自为知笔记(Wiz)

The article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159

The article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.

The article discusses the <iframe> tag's purpose in embedding external content into webpages, its common uses, security risks, and alternatives like object tags and APIs.

The article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati

The article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex

Article discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.

The article discusses the viewport meta tag, essential for responsive web design on mobile devices. It explains how proper use ensures optimal content scaling and user interaction, while misuse can lead to design and accessibility issues.

This article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit


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