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<!DOCTYPE html><html lang=en-GB-x-hixie class=big><title>HTML Standard</title><script>
var loadTimer = new Date();
var current_revision = "r" + "$Revision: 8642 $".substr(11);
current_revision = current_revision.substr(0, current_revision.length - 2);
var last_known_revision = current_revision;
function F( /* varargs... */) {
var fragment = document.createDocumentFragment();
for (var index = 0; index < arguments.length; index += 1) {
if (arguments[index] instanceof Array) {
fragment.appendChild(F.apply(this, arguments[index]));
} else if (typeof arguments[index] == 'string') {
fragment.appendChild(document.createTextNode(arguments[index]));
} else {
fragment.appendChild(arguments[index]);
}
}
return fragment;
}
function E(name, /* optional */ attributes /*, varargs... */) {
var element = document.createElement(name);
var index = 1;
if ((arguments.length > 1) && (typeof attributes != 'string') &&
(!(attributes instanceof Node)) && (!(attributes instanceof Array))) {
for (var attName in attributes) {
if (typeof attributes[attName] == 'boolean') {
if (attributes[attName])
element.setAttribute(attName, '');
} else if (typeof attributes[attName] == 'function') {
element[attName] = attributes[attName];
} else {
element.setAttribute(attName, attributes[attName]);
}
}
index = 2;
}
for (; index < arguments.length; index += 1) {
if (arguments[index] instanceof Array) {
element.appendChild(F.apply(this, arguments[index]));
} else if (typeof arguments[index] == 'string') {
element.appendChild(document.createTextNode(arguments[index]));
} else {
element.appendChild(arguments[index]);
}
}
return element;
}
function getCookie(name) {
var params = location.search.substr(1).split("&");
for (var index = 0; index < params.length; index++) {
if (params[index] == name)
return "1";
var data = params[index].split("=");
if (data[0] == name)
return unescape(data[1]);
}
var cookies = document.cookie.split("; ");
for (var index = 0; index < cookies.length; index++) {
var data = cookies[index].split("=");
if (data[0] == name)
return unescape(data[1]);
}
return null;
}
var currentAlert;
var currentAlertTimeout;
function showAlert(s, href) {
if (!currentAlert) {
currentAlert = document.createElement('div');
currentAlert.id = 'alert';
var x = document.createElement('button');
x.textContent = '\u2573';
x.onclick = closeAlert2;
currentAlert.appendChild(x);
currentAlert.appendChild(document.createElement('span'));
currentAlert.onmousemove = function () {
clearTimeout(currentAlertTimeout);
currentAlert.className = '';
currentAlertTimeout = setTimeout(closeAlert, 10000);
}
document.body.appendChild(currentAlert);
} else {
clearTimeout(currentAlertTimeout);
currentAlert.className = '';
}
currentAlert.lastChild.textContent = '';
currentAlert.lastChild.appendChild(F(s));
if (href) {
var link = document.createElement('a');
link.href = href;
link.textContent = href;
currentAlert.lastChild.appendChild(F(' ', link));
}
currentAlertTimeout = setTimeout(closeAlert, 10000);
}
function closeAlert() {
clearTimeout(currentAlertTimeout);
if (currentAlert) {
currentAlert.className = 'closed';
currentAlertTimeout = setTimeout(closeAlert2, 3000);
}
}
function closeAlert2() {
clearTimeout(currentAlertTimeout);
if (currentAlert) {
currentAlert.parentNode.removeChild(currentAlert);
currentAlert = null;
}
}
window.addEventListener('keydown', function (event) {
if (event.keyCode == 27) {
if (currentAlert)
closeAlert2();
} else {
closeAlert();
}
}, false);
window.addEventListener('scroll', function (event) {
closeAlert();
}, false);
function load(script) {
var e = document.createElement('script');
e.setAttribute('src', '//www.whatwg.org/specs/web-apps/current-work/' + script);
document.body.appendChild(e);
}
</script><link rel=stylesheet href=//www.whatwg.org/style/specification><link rel=icon href=//www.whatwg.org/images/icon><style>
.proposal { border: blue solid; padding: 1em; }
.bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
#updatesStatus { display: none; z-index: 10; }
#updatesStatus.relevant { display: block; position: fixed; right: 1em; top: 1em; padding: 0.5em; font: bold small sans-serif; min-width: 25em; width: 30%; max-width: 40em; height: auto; border: ridge 4px gray; background: #EEEEEE; color: black; }
div.head .logo { width: 11em; margin-bottom: 20em; }
#configUI { position: absolute; z-index: 20; top: auto; right: 0; width: 11em; padding: 0 0.5em 0 0.5em; font-size: small; background: gray; background: rgba(32,32,32,0.9); color: white; border-radius: 1em 0 0 1em; -moz-border-radius: 1em 0 0 1em; }
#configUI p { margin: 0.75em 0; padding: 0.3em; }
#configUI p label { display: block; }
#configUI #updateUI, #configUI .loginUI { text-align: center; }
#configUI input[type=button] { display: block; margin: auto; }
#configUI :link, #configUI :visited { color: white; }
#configUI :link:hover, #configUI :visited:hover { background: transparent; }
#alert { position: fixed; top: 20%; left: 20%; right: 20%; font-size: 2em; padding: 0.5em; z-index: 40; background: gray; background: rgba(32,32,32,0.9); color: white; border-radius: 1em; -moz-border-radius: 1em; -webkit-transition: opacity 1s linear; }
#alert.closed { opacity: 0; }
#alert button { position: absolute; top: -1em; right: 2em; border-radius: 1em 1em 0 0; border: none; line-height: 0.9; color: white; background: rgb(64,64,64); font-size: 0.6em; font-weight: 900; cursor: pointer; }
#alert :link, #alert :visited { color: white; }
#alert :link:hover, #alert :visited:hover { background: transparent; }
@media print { #configUI { display: none; } }
.rfc2119 { font-variant: small-caps; text-shadow: 0 0 0.5em yellow; position: static; }
.rfc2119::after { position: absolute; left: 0; width: 25px; text-align: center; color: yellow; text-shadow: 0.075em 0.075em 0.2em black; }
.rfc2119.m\ust::after { content: '\2605'; }
.rfc2119.s\hould::after { content: '\2606'; }
[hidden] { display: none; }
</style><style type=text/css>
.fingerprint { float: right; }
.applies thead th > * { display: block; }
.applies thead code { display: block; }
.applies td { text-align: center; }
.applies .yes { background: yellow; }
.matrix, .matrix td { border: hidden; text-align: right; }
.matrix { margin-left: 2em; }
.vertical-summary-table tr > th[rowspan="2"]:first-child + th,
.vertical-summary-table tr > td[rowspan="2"]:first-child + td { border-bottom: hidden; }
.dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
.dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
.dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
td.eg { border-width: thin; text-align: center; }
#table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
#table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
#table-example-1 caption { padding-bottom: 0.5em; }
#table-example-1 thead, #table-example-1 tbody { border: none; }
#table-example-1 th, #table-example-1 td { border: solid thin; }
#table-example-1 th { font-weight: normal; }
#table-example-1 td { border-style: none solid; vertical-align: top; }
#table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
#table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
#table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
#table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
#table-example-1 tbody td:first-child::after { content: leader(". "); }
#table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
#table-example-1 tbody td:first-child + td { width: 10em; }
#table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
#table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
.apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
.apple-table-examples * { font-family: "Times", serif; }
.apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
.apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
.apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
.apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
.apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
.apple-table-examples td { text-align: right; vertical-align: top; }
.apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
.apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
.apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
.apple-table-examples sup { line-height: 0; }
.three-column-nowrap tr > td:first-child,
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