DCGen / full_data /104.html
iforgott's picture
Upload dataset
70ee45d verified
<!DOCTYPE html> <html dir=ltr lang=en class="js fonts-loaded" style><!--
Page saved with SingleFile
url: https://w3.org
saved date: Thu May 23 2024 23:16:13 GMT+0800 (中国标准时间)
--><meta charset=utf-8>
<title>W3C</title>
<meta name=viewport content="width=device-width, initial-scale=1">
<meta name=description content="The World Wide Web Consortium (W3C) develops standards and guidelines to help everyone build a web based on the principles of accessibility, internationalization, privacy and security.">
<meta name=thumbnail content=https://www.w3.org/assets/website-2021/images/w3c-opengraph-image.png>
<meta property=og:url content=https://www.w3.org/>
<meta property=og:type content=website>
<meta property=og:title content=W3C>
<meta property=og:image content=https://www.w3.org/assets/website-2021/images/w3c-opengraph-image.png>
<meta property=og:image:width content=1200>
<meta property=og:image:height content=630>
<meta property=og:description content="The World Wide Web Consortium (W3C) develops standards and guidelines to help everyone build a web based on the principles of accessibility, internationalization, privacy and security.">
<meta property=og:site_name content=W3C>
<meta name=twitter:card content=summary_large_image>
<meta name=twitter:site content=w3c>
<meta name=twitter:url content=https://www.w3.org/>
<meta name=twitter:title content=W3C>
<meta name=twitter:description content="The World Wide Web Consortium (W3C) develops standards and guidelines to help everyone build a web based on the principles of accessibility, internationalization, privacy and security.">
<meta name=twitter:image content=https://www.w3.org/assets/website-2021/images/w3c-opengraph-image.png>
<link rel=home href=https://www.w3.org/>
<style media=screen>@font-face{font-family:noto sans;font-style:normal;font-weight:400;src:url()format("woff2")}@font-face{font-family:noto sans;font-style:italic;font-weight:400;src:url()format("woff2")}@font-face{font-family:noto sans;font-style:normal;font-weight:600;src:url()format("woff2")}@font-face{font-family:noto sans;font-style:italic;font-weight:600;src:url()format("woff2")}/*!normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css*/html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}a{background-color:transparent}abbr[title]{border-bottom:none;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}img{border-style:none}button{font-family:inherit;margin:0}button{overflow:visible}button{text-transform:none}button,[type=button]{-webkit-appearance:button}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}@media screen and (prefers-reduced-motion:reduce),(update:slow){*,::before,::after{animation-delay:-1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important;background-attachment:initial!important;scroll-behavior:auto!important;transition-duration:.001ms!important;transition-delay:0s!important}}html{height:100%}body{background-color:#fff;color:#111;min-height:100%;overflow-x:hidden;-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased}.grid-wrap{display:grid;grid-template-columns:100%;grid-template-rows:1fr auto;min-height:100vh}*,*::before,*::after{box-sizing:border-box;font-family:inherit;margin:0;overflow-wrap:break-word;padding:0}button,.button{background-color:#005797;border:solid 2px #005797;border-radius:1.5rem;display:inline-block;font-size:.875rem;font-weight:600;line-height:1.5;outline:2px solid transparent;outline-offset:-2px;padding:.6875rem 1.5rem}button:hover,.button:hover{background-color:#024488;border-color:#024488}button:focus,button:active,.button:focus,.button:active{color:#000;background-color:#f9dc4a;border-color:#000}button:not([type=submit]){text-align:start}.button{text-decoration:none}button.button{text-decoration:none}.button--alt{background-color:transparent;color:#005797}.button--alt:hover{background-color:#cbe0fb;color:#024488}.button--alt:focus,.button--alt:active{background-color:#f9dc4a;border-width:3px;color:#000;padding:.625rem 1.4375rem}.button--ghost{background-color:transparent;border-color:transparent;border-radius:0;color:#000;font-weight:400;padding-left:0;padding-right:0}.button--ghost:hover{background-color:transparent;border-color:transparent}:focus{outline:2px solid transparent;outline-offset:-2px}main:focus,#main:focus,[tabindex="-1"]:focus{outline:none}@supports ((-webkit-padding-start:1em) or (padding-inline-start:1em)){select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url(placeholder.png);background-position:center right .625rem;background-repeat:no-repeat;background-size:.9375rem;-webkit-padding-end:2.125rem;padding-inline-end:2.125rem}[dir=rtl] select{background-position:center left .625rem}}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}.global-header [role=status],.visuallyhidden:not(:focus):not(:active),.skip-link:not(:focus):not(:active){border:0;clip:rect(0 0 0 0);-webkit-clip-path:inset(100%);clip-path:inset(100%);height:1px;overflow:hidden;padding:0;position:absolute;white-space:nowrap;width:1px}.skip-link+*{margin-top:0!important}br{margin-top:0}abbr{-webkit-text-decoration-skip:ink;text-decoration-skip-ink:auto;text-underline-offset:.25em}svg{fill:currentColor}svg:not([class]){width:100%}.icon{height:1em;vertical-align:baseline;width:1em}.icon--larger{height:1.875rem;width:1.875rem}.with-icon--larger{display:inline-flex}.with-icon--after .icon,.with-icon--larger .icon{flex:0 0 auto}.with-icon--larger{align-items:center}@supports ((-webkit-margin-end:1em) or (margin-inline-end:1em)){.with-icon--before .icon{margin-right:0;-webkit-margin-end:.5rem;margin-inline-end:.5rem}}.with-icon--after .icon{margin-left:.5rem}@supports ((-webkit-margin-start:1em) or (margin-inline-start:1em)){.with-icon--after .icon{margin-left:0;-webkit-margin-start:.5rem;margin-inline-start:.5rem}}@supports ((-webkit-margin-start:1em) or (margin-inline-start:1em)){[dir=rtl] .with-icon--before .icon{margin-left:0;-webkit-margin-end:.5rem;margin-inline-end:.5rem}}@supports ((-webkit-margin-start:1em) or (margin-inline-start:1em)){[dir=rtl] .with-icon--after .icon{margin-right:0;-webkit-margin-start:.5rem;margin-inline-start:.5rem}}img{height:auto;max-width:100%}.avatar{background-color:#fff;border:solid 1px #005a9c;border-radius:50%;overflow:hidden}.avatar img{height:100%;-o-object-fit:cover;object-fit:cover;width:100%}.avatar--small{height:2rem;width:2rem}.avatar--small img{margin-top:0}a:not([class]),a.with-icon--after{border:0;color:#005797;cursor:pointer;padding-left:.125rem;padding-right:.125rem;text-decoration:underline;-webkit-text-decoration-skip:ink;text-decoration-skip-ink:auto;text-underline-offset:.25em}a:not([class]):visited,a.with-icon--before:visited,a.with-icon--after:visited{color:#920ba6}a:not([class]):hover,a.with-icon--before:hover,a.with-icon--after:hover{color:#024488;outline-width:0}a:not([class]):focus,a.with-icon--before:focus,a.with-icon--after:focus{background-color:#f9dc4a;background-image:linear-gradient(to top,#000 3px,#f9dc4a 3px,#f9dc4a);color:#000;text-decoration:none}a:not([class]):active,a.with-icon--before:active,a.with-icon--after:active{color:#000;outline-width:0}ul[class]{list-style:none;padding:0}ul:not([class]),ol:not([class]),ol.counter{-webkit-margin-after:1em;margin-block-end:1em;-webkit-margin-before:1em;margin-block-start:1em;-webkit-padding-start:2.4em;padding-inline-start:2.4em}ul:not([class])>*+*,ul:not([class]) li ul,ul:not([class]) li ol,ol:not([class])>*+*,ol:not([class]) li ul,ol:not([class]) li ol,ol.counter>*+*,ol.counter li ul,ol.counter li ol{margin-top:.75em}.clean-list li{display:block}@supports (grid-row-start:auto){dl.grid{-moz-column-gap:1rem;column-gap:1rem;display:grid;grid-template-columns:max-content;grid-template-rows:1fr;row-gap:1rem}dl.grid dd+dt,dl.grid dt+dd,dl.grid dd+dd{margin-top:0}dl.grid dt{grid-column-start:1;grid-column-end:2}dl.grid dd{grid-column-start:2;grid-column-end:3}}.skip-link{background-color:#f9dc4a;border:solid 3px #000;color:#000;padding:.625em .9375em;text-decoration:none}.skip-link:active,.skip-link:focus{left:0;position:absolute;top:0;z-index:999}@media screen{}body{font-size:1rem;font-style:normal;font-weight:400;line-height:1.5}p{margin:1rem 0}h1,h2,h3{font-weight:600;margin:0 0 1rem}h1{font-size:2.0625rem;line-height:1.303030303}@media screen and (min-width:48em){h1{font-size:2.625rem;line-height:1.4}}h2,.txt-earth{font-size:1.6875rem;line-height:1.2444444444}@media screen and (min-width:48em){h2,.txt-earth{font-size:2.125rem;line-height:1.2647058824}}.lead{font-size:1.4375rem;line-height:1.4}.txt-pluto{font-size:.9375rem;line-height:1.5}.fonts-loaded body{font-family:noto sans,trebuchet ms,Geneva,sans-serif}.l-box{display:block;padding:1.5rem}.l-box--no-padding{padding:0}.l-box--no-border{border:none;outline:1px solid transparent;outline-offset:-1px}.l-center.l-center{box-sizing:content-box;margin-left:auto;margin-right:auto;max-width:70rem;padding-left:5vw;padding-right:5vw}.l-cluster{overflow:hidden}.l-cluster>*{display:flex;flex-direction:row;flex-wrap:wrap}.l-cluster.l-cluster>*>*{display:inline-block}.l-sidebar{overflow:hidden}.l-sidebar>*{display:flex;flex-direction:row;flex-wrap:wrap}.l-sidebar .sidebar{flex-grow:1}.l-sidebar .not-sidebar{flex-basis:0;flex-grow:999}.global-header{background-color:#fff}#lang-nav{background-color:#f8f8fb}#lang-nav .l-cluster>*{justify-content:flex-end;margin:0-.625rem}#lang-nav .l-cluster.l-cluster>*>*{margin:0 .625rem}#lang-nav a{font-size:.875rem;line-height:1.4285714286;color:#111;display:block;padding-bottom:.75rem;padding-top:.75rem}@media screen{}@media screen and (min-width:64em){}.logo{display:block;height:2.75rem;position:relative;width:4.125rem}@media screen and (min-width:64em){.logo{height:3.25rem;width:4.875rem}}#global-nav svg{pointer-events:none}#global-nav{border-bottom:solid 1px #bdbdbd;display:block;padding-bottom:1.125rem;padding-top:1.125rem}@media screen and (min-width:70em){#global-nav{padding-bottom:0;padding-top:1.25rem}}.global-nav__inner{align-items:center;display:flex;flex-wrap:wrap}@media screen and (min-width:70em){.global-nav__inner{align-items:flex-end;flex-wrap:nowrap;position:relative}}.global-nav__inner>ul{background-color:#fff;display:flex;flex-basis:100%;flex-wrap:wrap;padding-bottom:2.8125rem;width:100%}@media screen and (min-width:70em){.global-nav__inner>ul{flex-basis:auto;flex-wrap:nowrap;padding-bottom:0}}@media screen and (min-width:70em){li.top-nav-item+li.top-nav-item{-webkit-margin-start:.25rem;margin-inline-start:.25rem}}@media screen and (min-width:70em){.global-nav__inner>ul>li:last-child{-webkit-margin-start:auto;margin-inline-start:auto}}.global-nav__inner .top-nav-item{border-bottom:solid 1px #bdbdbd;flex-basis:100%}@media screen and (min-width:70em){.global-nav__inner .top-nav-item{border-bottom:none;flex-basis:auto}}.nav-link{color:#111;display:block;padding:.625rem 0;position:relative;text-decoration:none}@media screen and (min-width:70em){.nav-link{display:inline-block}}.global-nav__inner .top-nav-item>.nav-link{font-weight:600}.logo-link:focus{box-shadow:0 0 0 3px #000;outline:solid 3px #f9dc4a;outline-offset:3px}@media screen and (min-width:70em){.logo-link{-webkit-margin-end:1.5625rem;margin-inline-end:1.5625rem;padding-bottom:.3125rem;position:relative}.logo-link::before{background-color:#005a9c;bottom:0;content:"";display:none;height:.1875rem;left:0;position:absolute;width:100%}.logo-link:hover::before{display:block}}.icon-link{align-items:center;color:#111;display:flex;min-height:2.75rem;text-decoration:none!important}@media screen and (min-width:70em){.icon-link{display:inline-flex;justify-content:center;height:100%;min-width:2.75rem}}.icon-link::before{bottom:0!important}.icon-link:visited,.icon-link:hover{color:#111!important}.icon-link:focus{background-color:#f9dc4a;background-image:linear-gradient(to top,#000 3px,#f9dc4a 3px,#f9dc4a);color:#000}.icon-link .hide-at-max-width{-webkit-margin-start:.625rem;margin-inline-start:.625rem}@media screen and (min-width:70em){.icon-link .hide-at-max-width{border:0;clip:rect(0 0 0 0);-webkit-clip-path:inset(100%);clip-path:inset(100%);height:1px;-webkit-margin-start:0;margin-inline-start:0;overflow:hidden;padding:0;position:absolute;white-space:nowrap;width:1px}}.account-login{flex-basis:100%;font-size:.875rem!important}@media screen and (min-width:70em){.account-login{flex-basis:auto;padding-bottom:.625rem;padding-top:.625rem}}@media screen and (min-width:70em){.global-nav__inner .top-nav-item>*:first-child{font-size:1rem;height:100%;line-height:1.6875rem;padding:.625rem .3125rem .4375rem!important;position:relative;white-space:nowrap}.global-nav__inner .top-nav-item>*:first-child::before{background-color:#005a9c;bottom:-.125rem;content:"";display:none;height:.1875rem;left:0;position:absolute;width:100%}.global-nav__inner .top-nav-item>*:first-child:hover::before{display:block}.global-nav__inner .top-nav-item>*:first-child:focus{background-color:#f9dc4a;background-image:linear-gradient(to top,#000 3px,#f9dc4a 3px,#f9dc4a);color:#000}.global-nav__inner .top-nav-item>*:first-child:focus:hover::before{display:none}}#main{box-sizing:content-box;margin-left:auto;margin-right:auto;max-width:70rem;padding:1.5rem 5vw 6.25rem}#main .component+.component{margin-top:5rem}@media screen and (min-width:48em){#main .component+.component{margin-top:6.25rem}}@media screen and (min-width:70em){.hero{padding-top:2.875rem}}.hero .l-sidebar>*,.hero .l-sidebar>*>*{margin:0}.hero .l-sidebar .sidebar{flex-basis:31.25rem}.hero .l-sidebar .not-sidebar{min-width:50%;padding-bottom:1.875rem}@media screen and (min-width:70em){.hero .l-sidebar .not-sidebar>*{max-width:31.5rem}}.hero .lead{margin-bottom:1.125rem;margin-top:0}.hero img{margin-left:auto;margin-right:auto}@media screen and (min-width:48em){.hero img{max-width:31.25rem}}.hero h1{margin-bottom:1rem}.hero+*{margin-top:3.125rem}.hero .button{align-self:flex-start}@media screen and (min-width:70em){}.component--columns{overflow:hidden}@media screen and (min-width:48em){.component--columns>ul{display:flex;flex-wrap:wrap;margin:-1.5%}}.component--columns>ul li+li{margin-top:1.25rem}@media screen and (min-width:48em){.component--columns>ul li+li{margin-top:0}}@media screen and (min-width:48em){.component--columns--images>ul>li{flex:1 0 33%;max-width:50%;padding:1.5%}}@media screen and (min-width:48em){.component--columns--images li:nth-last-child(n+4):nth-last-child(-n+4):first-child,.component--columns--images li:nth-last-child(n+4):nth-last-child(-n+4):first-child~li{flex-basis:50%}}@media screen and (min-width:48em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}.card{display:flex;flex-direction:column;height:100%}.card__text{flex-grow:1;order:1;padding-top:1rem}.card__heading{font-size:1.125rem;line-height:1.5}.card__link{border:0;color:#111;text-decoration:none}.card__link:hover{text-decoration:underline;-webkit-text-decoration-skip:ink;text-decoration-skip-ink:auto;text-underline-offset:.25em}.card__link:focus{background-color:#f9dc4a;background-image:linear-gradient(to top,#000 3px,#f9dc4a 3px,#f9dc4a);color:#000;text-decoration:none}@media screen and (min-width:48em){.component--fifty-fifty{align-items:flex-start;display:flex;flex-wrap:wrap;justify-content:space-between}}.component--fifty-fifty>*+*{margin-top:1rem}@media screen and (min-width:48em){.component--fifty-fifty>*+*{margin-top:0}}@media screen and (min-width:48em){.component--fifty-fifty__text{flex-basis:52%}}@media screen and (min-width:64em){.component--fifty-fifty__text{flex-basis:45%}}.component--fifty-fifty__text .l-box{display:flex;flex-direction:column;justify-content:flex-start;margin-top:1.875rem}.component--fifty-fifty__text .l-box a{align-self:flex-start}@media screen and (min-width:48em){.component--fifty-fifty .image{flex-basis:45%}}.component--fifty-fifty .image img{border-radius:.25rem}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}.component--members{background-color:#f8f8fb}.component--members .l-center>h2,.component--members .l-center>p{max-width:41.25rem}.component--members__grid{display:flex;flex-wrap:wrap;margin-bottom:1rem}@supports (display:grid){.component--members__grid{display:grid;grid-auto-rows:minmax(10.625rem,auto);grid-gap:1.25rem;grid-template-columns:repeat(auto-fill,minmax(10.625rem,1fr))}}.component--members__grid figure{align-items:center;background-color:#fff;display:flex;justify-content:center;margin-bottom:1.25rem;margin-left:.625rem;margin-right:.625rem;flex:1 1 10.625rem;position:relative}@supports (display:grid){.component--members__grid figure{margin:0}}.component--members__grid .l-box{max-width:10.625rem}.component--members__grid+a{align-self:flex-start}@media screen and (min-width:48em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@media screen and (min-width:48em){}@supports ((-o-object-fit:contain) or (object-fit:contain)){.slide__logo>img{height:100%;max-width:none;-o-object-fit:contain;object-fit:contain;position:static}}.crosslinks{background-color:#005a9c;color:#fff;padding-bottom:3.125rem;padding-top:3.125rem}.crosslinks .component--columns__intro h2{font-size:1.5rem;line-height:1.4}.crosslinks .component--columns__intro a,.crosslinks .component--columns__intro a:visited,.crosslinks .component--columns__intro a:hover,.crosslinks .component--columns__intro a:active{color:#fff}@media screen and (min-width:43.75em){.crosslinks .component--columns--images>ul{display:flex;flex-wrap:wrap;margin:-1.5%}}@media screen and (min-width:43.75em){.crosslinks .component--columns--images>ul>li{flex:1 0 50%;max-width:50%;padding:1.5%}}@media screen and (min-width:43.75em){.crosslinks .component--columns--images>ul li+li{margin-top:0}}@media screen and (min-width:43.75em){.crosslinks .component--columns--images li:nth-last-child(n+3):nth-last-child(-n+3):first-child,.crosslinks .component--columns--images li:nth-last-child(n+3):nth-last-child(-n+3):first-child~li{flex-basis:33%}}@media screen and (min-width:64em){.crosslinks .component--columns--images li:nth-last-child(n+4):nth-last-child(-n+4):first-child,.crosslinks .component--columns--images li:nth-last-child(n+4):nth-last-child(-n+4):first-child~li{flex-basis:25%}}.crosslinks .card{background-color:#fff;border-radius:.25rem;color:#111;overflow:hidden}.crosslinks .card__text{padding:1.25rem}@supports ((-webkit-padding-start:1em) or (padding-inline-start:1em)){input[type=search]{background-image:url(placeholder.png);background-position:center left .5em;background-repeat:no-repeat;background-size:1.25rem;-webkit-padding-start:2.5rem;padding-inline-start:2.5rem}[dir=rtl] input[type=search]{background-position:center right .5em}}@media screen and (min-width:64em){}.global-footer{border-top:solid 1px #bdbdbd;grid-row-start:2;grid-row-end:3;padding:1.25rem 0 1.5625rem}.global-footer .l-center{display:flex;flex-direction:column;justify-content:flex-start}.global-footer .l-center>*+*{margin-top:1rem}.global-footer a,.global-footer .copyright{font-size:.875rem;line-height:1.4285714286}.global-footer .copyright{margin-bottom:0}.global-footer a{color:#111}.global-footer a:visited,.global-footer a:hover,.global-footer a:active{color:#111}.global-footer__links{display:flex;flex-wrap:wrap}.global-footer__links>ul{display:flex;flex-wrap:wrap}@media screen and (min-width:64em){.global-footer__links>ul{-webkit-margin-start:auto;margin-inline-start:auto}}.global-footer__links .l-cluster>*{margin:0-.625rem}.global-footer__links .l-cluster.l-cluster>*>*{margin:0 .625rem}.global-footer__links a:not([class]){display:block;padding-bottom:.75rem;padding-top:.75rem}.global-footer__links .with-icon--larger{padding:.75rem}.global-footer__links .with-icon--larger img{height:1.25rem;width:1.25rem}.global-footer__links .with-icon--larger:focus{background-color:#f9dc4a;background-image:linear-gradient(to top,#000 3px,#f9dc4a 3px,#f9dc4a)}@supports (grid-column-gap:8%){.default .content{max-width:none}@media screen and (min-width:64em){.default .content{display:grid;grid-column-gap:7.857%;grid-template-areas:"article related";grid-template-columns:67.143% 25%}}@media screen and (min-width:64em){.default .content article{grid-area:article}}@media screen and (min-width:64em){.default .content .related{grid-area:related}}}@supports (grid-column-gap:8%){@media screen and (min-width:64em){.default .related{margin-top:0}}}@media screen and (min-width:64em){}.home .hero{background-color:#fff}.home .component--members{padding-bottom:2.5rem;padding-top:2.5rem}.home .component--members__grid{margin-top:2.5rem}@supports (grid-column-gap:8%){.post .content{max-width:none}@media screen and (min-width:64em){.post .content{display:grid;grid-column-gap:7.857%;grid-template-columns:67.143% 25%;grid-template-areas:"article related"}}@media screen and (min-width:64em){.post .content article{grid-area:article}}@media screen and (min-width:64em){.post .content .related{grid-area:related}}}@supports (grid-column-gap:8%){@media screen and (min-width:64em){.post .content .related{margin-top:0}}}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:48em){}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@supports (grid-column-gap:8%){.profile .content{max-width:none}@media screen and (min-width:64em){.profile .content{display:grid;grid-column-gap:7.857%;grid-template-areas:"title nav""details nav";grid-template-columns:67.143% 25%;grid-template-rows:auto 1fr}}@media screen and (min-width:64em){.profile .content h1{grid-area:title}}@media screen and (min-width:64em){.profile .content #profile-nav{grid-area:nav}}@media screen and (min-width:64em){.profile .content .details{grid-area:details}}}@media screen and (min-width:64em){}@media screen and (min-width:64em){}@media screen and (min-width:80em){}@media screen and (min-width:80em){}@media screen and (min-width:80em){}.u-full-width{left:50%;margin-left:-50vw;margin-right:-50vw;position:relative;right:50%;width:100vw}</style>
<style media="
only print,
only all and (pointer: fine), only all and (pointer: coarse), only all and (pointer: none),
only all and (min--moz-device-pixel-ratio:0) and (display-mode:browser), (min--moz-device-pixel-ratio:0) and (display-mode:fullscreen)
">[data-trigger=account-menu] .sr-only,.visuallyhidden:not(:focus):not(:active){border:0;clip:rect(0 0 0 0);-webkit-clip-path:inset(100%);clip-path:inset(100%);height:1px;overflow:hidden;padding:0;position:absolute;white-space:nowrap;width:1px}br{margin-top:0}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}[data-trigger=mobile-nav]{font-size:.875rem;padding:.4375rem 0}[data-trigger=mobile-nav]:focus{background-color:#f9dc4a;border-color:#000}[data-trigger=mobile-nav][aria-expanded=true] .menu-icon{display:none}@media screen and (min-width:70em){}[data-trigger=mobile-nav]{margin-left:auto}#global-nav{position:relative;z-index:2}.global-nav__inner>ul{border-bottom:solid 1px #bdbdbd;box-shadow:0 8px 16px -5px rgba(55,70,95,.07);display:flex;flex-basis:100%;flex-wrap:wrap;left:0;padding-bottom:2.8125rem;padding-left:5vw;padding-right:5vw;position:absolute;top:100%;width:100%}@media screen and (min-width:70em){.global-nav__inner>ul{border:none;box-shadow:none;flex-basis:auto;flex-wrap:nowrap;padding-bottom:0;padding-left:0;padding-right:0;position:static}}.icon--submenu{-webkit-margin-start:auto;margin-inline-start:auto}@media screen and (min-width:70em){.icon--submenu{-webkit-margin-start:.25rem;margin-inline-start:.25rem;transform:rotate(90deg)}}.global-nav__inner [data-trigger=sub-nav]{align-items:center;background-color:transparent;border-color:transparent;border-radius:0;color:#111;display:flex;font-size:1rem;line-height:inherit;outline:solid 1px transparent;outline-offset:-1px;padding:.75rem 0;width:100%}@media screen and (min-width:70em){.global-nav__inner [data-trigger=sub-nav]{display:inline-flex}}.global-nav__inner [data-trigger=sub-nav]:focus{background-color:#f9dc4a;background-image:none!important;border-color:#000}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}@media screen and (min-width:70em){}.js [data-component=card]{cursor:pointer}.js [data-component=card]:hover .card__link{text-decoration:underline;-webkit-text-decoration-skip:ink;text-decoration-skip-ink:auto;text-underline-offset:.25em}.js [data-component=card] .card__text>:nth-last-child(2){margin-bottom:1rem}.js [data-component=card] .card__text>:last-child{margin-bottom:0;margin-top:auto}</style>
<meta name=referrer content=no-referrer><link type=image/x-icon rel="shortcut icon" href="placeholder.png"><style>.sf-hidden{display:none!important}</style><link rel=canonical href=https://w3.org><meta http-equiv=content-security-policy content="default-src 'none'; font-src 'self' data:; img-src 'self' placeholder.png; style-src 'unsafe-inline'; media-src 'self' data:; script-src 'unsafe-inline' data:; object-src 'self' data:; frame-src 'self' data:;"><style>img[src="data:,"],source[src="data:,"]{display:none!important}</style></head>
<body class=home>
<a class=skip-link href=https://www.w3.org/#main>Skip to content</a>
<div class=grid-wrap>
<div class=wrap>
<header class=global-header>
<span role=status aria-live=polite></span>
<nav id=lang-nav aria-label="Language options">
<div class=l-center>
<div class=l-cluster>
<ul class=clean-list role=list>
<li><a href=https://www.w3.org/ja/ hreflang=ja lang=ja>日本語ホームページ<span class=visuallyhidden lang=en>Japanese website</span></a></li>
<li><a href=https://www.w3.org/zh-hans/ hreflang=zh-hans lang=zh-hans>简体中文首页<span class=visuallyhidden lang=en>Chinese website</span></a></li>
</ul>
</div>
</div>
</nav>
<nav id=global-nav aria-label=Main>
<div class="global-nav__inner l-center js-nav-with-intro">
<a class=logo-link href=https://www.w3.org/ hreflang=en>
<span class=logo>
<img src="placeholder.png" alt=W3C role=img>
</span>
<span class=visuallyhidden>Visit the W3C homepage</span>
</a>
<button type=button class="button button--ghost with-icon--after with-icon--larger" data-trigger=mobile-nav style=display:none aria-expanded=true>Menu<svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 448 512" height=30 width=30 class="icon icon--larger" focusable=false aria-hidden=true fill=currentColor><path class=menu-icon d="M16 132h416c8.837 0 16-7.163 16-16V76c0-8.837-7.163-16-16-16H16C7.163 60 0 67.163 0 76v40c0 8.837 7.163 16 16 16zm0 160h416c8.837 0 16-7.163 16-16v-40c0-8.837-7.163-16-16-16H16c-8.837 0-16 7.163-16 16v40c0 8.837 7.163 16 16 16zm0 160h416c8.837 0 16-7.163 16-16v-40c0-8.837-7.163-16-16-16H16c-8.837 0-16 7.163-16 16v40c0 8.837 7.163 16 16 16z"></path><path class=close-icon d="M242.72 256l100.07-100.07c12.28-12.28 12.28-32.19 0-44.48l-22.24-22.24c-12.28-12.28-32.19-12.28-44.48 0L176 189.28 75.93 89.21c-12.28-12.28-32.19-12.28-44.48 0L9.21 111.45c-12.28 12.28-12.28 32.19 0 44.48L109.28 256 9.21 356.07c-12.28 12.28-12.28 32.19 0 44.48l22.24 22.24c12.28 12.28 32.2 12.28 44.48 0L176 322.72l100.07 100.07c12.28 12.28 32.2 12.28 44.48 0l22.24-22.24c12.28-12.28 12.28-32.19 0-44.48L242.72 256z"></path></svg></button>
<ul class=clean-list data-component=nav-double-intro>
<li class="top-nav-item has-children">
<button data-trigger=sub-nav class=nav-link aria-controls=js-standards-submenu aria-expanded=false>Standards <svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 256 512" height=16 width=16 class="icon icon--submenu" focusable=false aria-hidden=true fill=currentColor><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"></path></svg></button>
<div class="nav__submenu sf-hidden" data-nav=submenu id=js-standards-submenu>
</div>
</li>
<li class="top-nav-item has-children">
<button data-trigger=sub-nav class=nav-link aria-controls=js-groups-submenu aria-expanded=false>Groups <svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 256 512" height=16 width=16 class="icon icon--submenu" focusable=false aria-hidden=true fill=currentColor><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"></path></svg></button>
<div class="nav__submenu sf-hidden" data-nav=submenu id=js-groups-submenu>
</div>
</li>
<li class="top-nav-item has-children">
<button data-trigger=sub-nav class=nav-link aria-controls=js-get-involved-submenu aria-expanded=false>Get involved <svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 256 512" height=16 width=16 class="icon icon--submenu" focusable=false aria-hidden=true fill=currentColor><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"></path></svg></button>
<div class="nav__submenu sf-hidden" data-nav=submenu id=js-get-involved-submenu>
</div>
</li>
<li class="top-nav-item has-children">
<button data-trigger=sub-nav class=nav-link aria-controls=js-resources-submenu aria-expanded=false>Resources <svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 256 512" height=16 width=16 class="icon icon--submenu" focusable=false aria-hidden=true fill=currentColor><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"></path></svg></button>
<div class="nav__submenu sf-hidden" data-nav=submenu id=js-resources-submenu>
</div>
</li>
<li class="top-nav-item has-children">
<button data-trigger=sub-nav class=nav-link aria-controls=js-news-and-events-submenu aria-expanded=false>News and events <svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 256 512" height=16 width=16 class="icon icon--submenu" focusable=false aria-hidden=true fill=currentColor><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"></path></svg></button>
<div class="nav__submenu sf-hidden" data-nav=submenu id=js-news-and-events-submenu>
</div>
</li>
<li class="top-nav-item has-children">
<button data-trigger=sub-nav class=nav-link aria-controls=js-about-submenu aria-expanded=false>About <svg xmlns=http://www.w3.org/2000/svg viewBox="0 0 256 512" height=16 width=16 class="icon icon--submenu" focusable=false aria-hidden=true fill=currentColor><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"></path></svg></button>
<div class="nav__submenu sf-hidden" data-nav=submenu id=js-about-submenu>
</div>
</li>
<li class=top-nav-item>
<a hreflang=en href=https://www.w3.org/help/search/ class="nav-link icon-link">
<img class=icon src="placeholder.png" width=24 height=24 alt aria-hidden=true><span class=hide-at-max-width>Search</span>
</a>
</li>
<li class=top-nav-item>
<a hreflang=en href="https://auth.w3.org/?url=https://www.w3.org/" id=account-login-link class="account-login icon-link with-icon--after">Sign in<span class="avatar avatar--small icon">
<img src="placeholder.png" width=24 height=24 alt aria-hidden=true>
</span>
</a>
</li>
</ul>
</div>
</nav>
</header>
<main id=main>
<div class="u-full-width hero">
<div class=l-center>
<div class=l-sidebar>
<div>
<div class=not-sidebar>
<h1>Making the Web work</h1>
<div class=lead><p>The World Wide Web Consortium (W3C) develops <a href=https://www.w3.org/standards/>standards and guidelines</a> to help everyone build a web based on the principles of <a href=https://www.w3.org/mission/accessibility/>accessibility</a>, <a href=https://www.w3.org/mission/internationalization/>internationalization</a>, <a href=https://www.w3.org/mission/privacy/>privacy</a> and <a href=https://www.w3.org/mission/security/>security</a>.</p></div>
<a class="button button--alt" href=https://www.w3.org/about/>Read more about W3C</a>
</div>
<div class=sidebar>
<img src=placeholder.png alt>
</div>
</div>
</div>
</div>
</div>
<div class="component component--members u-full-width">
<div class=l-center>
<h2>Working with stakeholders of the Web</h2> <p>A range of organizations join the World Wide Web Consortium as Members to work with us to drive the direction of core web technologies and exchange ideas with industry and research leaders. We rotate randomly a few of our Member organizations' logos underneath.<p>The Web Consortium and its members, with help from the public and the web community, focus on a range of business ecosystems that the Web transforms, including&nbsp;<a href=https://www.w3.org/ecosystems/e-commerce/>E-commerce</a>,&nbsp;<a href=https://www.w3.org/ecosystems/media/>Media &amp; Entertainment</a>, <a href=https://www.w3.org/ecosystems/publishing/>Publishing</a> and several other areas.</p>
<div class=component--members__grid><figure><div class="l-box l-box--no-border"><img src=placeholder.png alt="AudioEye, Inc." loading=lazy></div></figure><figure><div class="l-box l-box--no-border"><img src="placeholder.png" alt="Inrupt Inc." loading=lazy></div></figure><figure><div class="l-box l-box--no-border"><img src="placeholder.png" alt="Navy Federal Credit Union" loading=lazy></div></figure><figure><div class="l-box l-box--no-border"><img src="placeholder.png" alt="Digitaal Vlaanderen" loading=lazy></div></figure><figure><div class="l-box l-box--no-border"><img src=placeholder.png alt="DirectOffer, Inc." loading=lazy></div></figure><figure><div class="l-box l-box--no-border"><img src=placeholder.png alt="Kadokawa Corporation" loading=lazy></div></figure></div>
<a class="button button--alt" href=https://www.w3.org/ecosystems/>Discover how W3C supports these organizations</a>
</div>
</div>
<section class="component component--fifty-fifty">
<div class=image>
<img src="placeholder.png" srcset sizes loading=lazy alt>
</div>
<div class=component--fifty-fifty__text>
<h2 class=txt-earth>Web standards</h2>
<p>Web standards are the building blocks of a consistent digitally connected world. They are implemented in browsers, blogs, search engines, and other software that power our experience on the Web.<p>W3C is an international community where <a href=https://www.w3.org/membership/list/>Members</a>, full-time <a href=https://www.w3.org/staff/>staff</a>, and the public work together to develop web standards.</p>
<div class="l-box l-box--no-border l-box--no-padding">
<a class="button button--alt" href=https://www.w3.org/standards/>Learn more about Web standards</a>
</div>
</div>
</section>
<section class="component component--fifty-fifty">
<div class=image>
<img src=placeholder.png srcset sizes loading=lazy alt>
</div>
<div class=component--fifty-fifty__text>
<h2 class=txt-earth>Get involved</h2>
<p>W3C works at the nexus of core technology, industry needs, and societal needs. Everyone can get involved with the work we do.<p>There are many ways individuals and organizations can participate in the Web Consortium to advance web standardization.</p>
<div class="l-box l-box--no-border l-box--no-padding">
<a class="button button--alt" href=https://www.w3.org/get-involved/>Ways to get involved</a>
</div>
</div>
</section>
</main>
<aside class=crosslinks>
<div class=l-center>
<div class="component component--columns component--columns--images">
<div class=component--columns__intro>
<h2>Latest news</h2>
<p>Latest entries from across our <a href=https://www.w3.org/news/>News</a>, <a href=https://www.w3.org/press-releases/>Press Releases</a> or <a href=https://www.w3.org/blog/>Blog</a>.&nbsp;</p>
</div>
<ul class=clean-list role=presentation>
<li>
<div class=card data-component=card>
<div class=card__text>
<h3 class=card__heading>
<a href=https://www.w3.org/news/2024/first-public-working-draft-controller-documents-1-0/ class=card__link>First Public Working Draft: Controller Documents 1.0</a>
</h3>
<p>
A controller document is a set of data that specifies one or more relationships between a controller and a set of data, such as a set of public cryptographic keys. </p>
<p class=txt-pluto>
News </p>
</div>
</div>
</li>
<li>
<div class=card data-component=card>
<div class=card__text>
<h3 class=card__heading>
<a href=https://www.w3.org/news/2024/authorized-translation-of-wcag-2-2-in-catalan/ class=card__link>Authorized Translation of WCAG 2.2 in Catalan</a>
</h3>
<p>
W3C published the Authorized Catalan Translation of Web Content Accessibility Guidelines (WCAG) 2.2, Directrius per a l'accessibilitat del contingut web (WCAG) 2.2. </p>
<p class=txt-pluto>
News </p>
</div>
</div>
</li>
<li>
<div class=card data-component=card>
<div class=card__text>
<h3 class=card__heading>
<a href=https://www.w3.org/news/2024/updated-w3c-recommendation-media-queries-level-3/ class=card__link>Updated W3C Recommendation: Media Queries Level 3</a>
</h3>
<p>
The CSS Working Group has republished Media Queries Level 3 as an updated W3C Recommendation. </p>
<p class=txt-pluto>
News </p>
</div>
</div>
</li>
<li>
<div class=card data-component=card>
<div class=card__text>
<h3 class=card__heading>
<a href=https://www.w3.org/news/2024/rdf-dataset-canonicalization-is-a-w3c-recommendation/ class=card__link>RDF Dataset Canonicalization is a W3C Recommendation</a>
</h3>
<p>
The RDF Dataset Canonicalization and Hash Working Group published RDF Dataset Canonicalization as a W3C Recommendation. </p>
<p class=txt-pluto>
News </p>
</div>
</div>
</li>
</ul>
</div>
</div>
</aside>
</div>
<footer class=global-footer>
<div class=l-center>
<div class=global-footer__links>
<div class=l-cluster>
<ul class=clean-list role=list>
<li>
<a href=https://www.w3.org/ hreflang=en>
<span lang=en dir=ltr>Home</span>
</a>
</li>
<li>
<a href=https://www.w3.org/contact/ hreflang=en>
<span lang=en dir=ltr>Contact</span>
</a>
</li>
<li>
<a href=https://www.w3.org/help/ hreflang=en>
<span lang=en dir=ltr>Help</span>
</a>
</li>
<li>
<a href=https://www.w3.org/donate/ hreflang=en>
<span lang=en dir=ltr>Donate</span>
</a>
</li>
<li>
<a href=https://www.w3.org/policies/ hreflang=en>
<span lang=en dir=ltr>Legal &amp; Policies</span>
</a>
</li>
<li>
<a href=https://www.w3.org/about/corporation/ hreflang=en>
<span lang=en dir=ltr>Corporation</span>
</a>
</li>
<li>
<a href=https://status.w3.org/ hreflang=en>
<span lang=en dir=ltr>System Status</span>
</a>
</li>
</ul>
</div>
<ul class=clean-list role=list>
<li><a class=with-icon--larger href=https://w3c.social/@w3c hreflang=en>
<img class="icon icon--larger" src="placeholder.png" width=20 height=20 alt aria-hidden=true loading=lazy>
<span class=visuallyhidden><span lang=en dir=ltr>W3C on Mastodon</span></span></a>
</li>
<li><a class=with-icon--larger href=https://github.com/w3c/ hreflang=en>
<img class="icon icon--larger" src="placeholder.png" width=20 height=20 alt aria-hidden=true loading=lazy>
<span class=visuallyhidden><span lang=en dir=ltr>W3C on GitHub</span></span></a>
</li>
</ul>
</div>
<p class=copyright><span lang=en dir=ltr>Copyright © 2024 <a href=https://www.w3.org/>World Wide Web Consortium</a>.<br> <abbr title="World Wide Web Consortium">W3C</abbr><sup>®</sup> <a href=https://www.w3.org/policies/#disclaimers>liability</a>, <a href=https://www.w3.org/policies/#trademarks>trademark</a> and <a rel=license href=https://www.w3.org/copyright/document-license/ title="W3C Document License">permissive license</a> rules apply.</span></p>
</div>
</footer>
</div>