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<!doctype html>
<head><meta charset="utf-8">
<link rel="stylesheet" href="./spec.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/github.min.css">
<script src="./spec.js"></script>
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License","titleHTML":"Copyright & Software License","number":"A","namespace":"https://github.com/tc39/proposal-intl-DateTimeFormat-formatRange","location":"","referencingIds":[],"key":"Copyright & Software License"}]</script><script>"use strict";
function Search(menu) {
this.menu = menu;
this.$search = document.getElementById('menu-search');
this.$searchBox = document.getElementById('menu-search-box');
this.$searchResults = document.getElementById('menu-search-results');
this.loadBiblio();
document.addEventListener('keydown', this.documentKeydown.bind(this));
this.$searchBox.addEventListener('keydown', debounce(this.searchBoxKeydown.bind(this), { stopPropagation: true }));
this.$searchBox.addEventListener('keyup', debounce(this.searchBoxKeyup.bind(this), { stopPropagation: true }));
}
Search.prototype.loadBiblio = function () {
var $biblio = document.getElementById('menu-search-biblio');
if (!$biblio) {
this.biblio = [];
} else {
this.biblio = JSON.parse($biblio.textContent);
this.biblio.clauses = this.biblio.filter(function (e) { return e.type === 'clause' });
this.biblio.byId = this.biblio.reduce(function (map, entry) {
map[entry.id] = entry;
return map;
}, {});
}
}
Search.prototype.documentKeydown = function (e) {
if (e.keyCode === 191) {
e.preventDefault();
e.stopPropagation();
this.triggerSearch();
}
}
Search.prototype.searchBoxKeydown = function (e) {
e.stopPropagation();
e.preventDefault();
if (e.keyCode === 191 && e.target.value.length === 0) {
e.preventDefault();
} else if (e.keyCode === 13) {
e.preventDefault();
this.selectResult();
}
}
Search.prototype.searchBoxKeyup = function (e) {
if (e.keyCode === 13 || e.keyCode === 9) {
return;
}
this.search(e.target.value);
}
Search.prototype.triggerSearch = function (e) {
if (this.menu.isVisible()) {
this._closeAfterSearch = false;
} else {
this._closeAfterSearch = true;
this.menu.show();
}
this.$searchBox.focus();
this.$searchBox.select();
}
// bit 12 - Set if the result starts with searchString
// bits 8-11: 8 - number of chunks multiplied by 2 if cases match, otherwise 1.
// bits 1-7: 127 - length of the entry
// General scheme: prefer case sensitive matches with fewer chunks, and otherwise
// prefer shorter matches.
function relevance(result, searchString) {
var relevance = 0;
relevance = Math.max(0, 8 - result.match.chunks) << 7;
if (result.match.caseMatch) {
relevance *= 2;
}
if (result.match.prefix) {
relevance += 2048
}
relevance += Math.max(0, 255 - result.entry.key.length);
return relevance;
}
Search.prototype.search = function (searchString) {
var s = Date.now();
if (searchString === '') {
this.displayResults([]);
this.hideSearch();
return;
} else {
this.showSearch();
}
if (searchString.length === 1) {
this.displayResults([]);
return;
}
var results;
if (/^[\d\.]*$/.test(searchString)) {
results = this.biblio.clauses.filter(function (clause) {
return clause.number.substring(0, searchString.length) === searchString;
}).map(function (clause) {
return { entry: clause };
});
} else {
results = [];
for (var i = 0; i < this.biblio.length; i++) {
var entry = this.biblio[i];
if (!entry.key) {
// biblio entries without a key aren't searchable
continue;
}
var match = fuzzysearch(searchString, entry.key);
if (match) {
results.push({ entry: entry, match: match });
}
}
results.forEach(function (result) {
result.relevance = relevance(result, searchString);
});
results = results.sort(function (a, b) { return b.relevance - a.relevance });
}
if (results.length > 50) {
results = results.slice(0, 50);
}
this.displayResults(results);
}
Search.prototype.hideSearch = function () {
this.$search.classList.remove('active');
}
Search.prototype.showSearch = function () {
this.$search.classList.add('active');
}
Search.prototype.selectResult = function () {
var $first = this.$searchResults.querySelector('li:first-child a');
if ($first) {
document.location = $first.getAttribute('href');
}
this.$searchBox.value = '';
this.$searchBox.blur();
this.displayResults([]);
this.hideSearch();
if (this._closeAfterSearch) {
this.menu.hide();
}
}
Search.prototype.displayResults = function (results) {
if (results.length > 0) {
this.$searchResults.classList.remove('no-results');
var html = '<ul>';
results.forEach(function (result) {
var entry = result.entry;
var id = entry.id;
var cssClass = '';
var text = '';
if (entry.type === 'clause') {
var number = entry.number ? entry.number + ' ' : '';
text = number + entry.key;
cssClass = 'clause';
id = entry.id;
} else if (entry.type === 'production') {
text = entry.key;
cssClass = 'prod';
id = entry.id;
} else if (entry.type === 'op') {
text = entry.key;
cssClass = 'op';
id = entry.id || entry.refId;
} else if (entry.type === 'term') {
text = entry.key;
cssClass = 'term';
id = entry.id || entry.refId;
}
if (text) {
html += '<li class=menu-search-result-' + cssClass + '><a href="#' + id + '">' + text + '</a></li>'
}
});
html += '</ul>'
this.$searchResults.innerHTML = html;
} else {
this.$searchResults.innerHTML = '';
this.$searchResults.classList.add('no-results');
}
}
function Menu() {
this.$toggle = document.getElementById('menu-toggle');
this.$menu = document.getElementById('menu');
this.$toc = document.querySelector('menu-toc > ol');
this.$pins = document.querySelector('#menu-pins');
this.$pinList = document.getElementById('menu-pins-list');
this.$toc = document.querySelector('#menu-toc > ol');
this.$specContainer = document.getElementById('spec-container');
this.search = new Search(this);
this._pinnedIds = {};
this.loadPinEntries();
// toggle menu
this.$toggle.addEventListener('click', this.toggle.bind(this));
// keydown events for pinned clauses
document.addEventListener('keydown', this.documentKeydown.bind(this));
// toc expansion
var tocItems = this.$menu.querySelectorAll('#menu-toc li');
for (var i = 0; i < tocItems.length; i++) {
var $item = tocItems[i];
$item.addEventListener('click', function($item, event) {
$item.classList.toggle('active');
event.stopPropagation();
}.bind(null, $item));
}
// close toc on toc item selection
var tocLinks = this.$menu.querySelectorAll('#menu-toc li > a');
for (var i = 0; i < tocLinks.length; i++) {
var $link = tocLinks[i];
$link.addEventListener('click', function(event) {
this.toggle();
event.stopPropagation();
}.bind(this));
}
// update active clause on scroll
window.addEventListener('scroll', debounce(this.updateActiveClause.bind(this)));
this.updateActiveClause();
// prevent menu scrolling from scrolling the body
this.$toc.addEventListener('wheel', function (e) {
var target = e.currentTarget;
var offTop = e.deltaY < 0 && target.scrollTop === 0;
if (offTop) {
e.preventDefault();
}
var offBottom = e.deltaY > 0
&& target.offsetHeight + target.scrollTop >= target.scrollHeight;
if (offBottom) {
e.preventDefault();
}
})
}
Menu.prototype.documentKeydown = function (e) {
e.stopPropagation();
if (e.keyCode === 80) {
this.togglePinEntry();
} else if (e.keyCode > 48 && e.keyCode < 58) {
this.selectPin(e.keyCode - 49);
}
}
Menu.prototype.updateActiveClause = function () {
this.setActiveClause(findActiveClause(this.$specContainer))
}
Menu.prototype.setActiveClause = function (clause) {
this.$activeClause = clause;
this.revealInToc(this.$activeClause);
}
Menu.prototype.revealInToc = function (path) {
var current = this.$toc.querySelectorAll('li.revealed');
for (var i = 0; i < current.length; i++) {
current[i].classList.remove('revealed');
current[i].classList.remove('revealed-leaf');
}
var current = this.$toc;
var index = 0;
while (index < path.length) {
var children = current.children;
for (var i = 0; i < children.length; i++) {
if ('#' + path[index].id === children[i].children[1].getAttribute('href') ) {
children[i].classList.add('revealed');
if (index === path.length - 1) {
children[i].classList.add('revealed-leaf');
var rect = children[i].getBoundingClientRect();
this.$toc.getBoundingClientRect().top
var tocRect = this.$toc.getBoundingClientRect();
if (rect.top + 10 > tocRect.bottom) {
this.$toc.scrollTop = this.$toc.scrollTop + (rect.top - tocRect.bottom) + (rect.bottom - rect.top);
} else if (rect.top < tocRect.top) {
this.$toc.scrollTop = this.$toc.scrollTop - (tocRect.top - rect.top);
}
}
current = children[i].querySelector('ol');
index++;
break;
}
}
}
}
function findActiveClause(root, path) {
var clauses = new ClauseWalker(root);
var $clause;
var found = false;
var path = path || [];
while ($clause = clauses.nextNode()) {
var rect = $clause.getBoundingClientRect();
var $header = $clause.children[0];
var marginTop = parseInt(getComputedStyle($header)["margin-top"]);
if ((rect.top - marginTop) <= 0 && rect.bottom > 0) {
found = true;
return findActiveClause($clause, path.concat($clause)) || path;
}
}
return path;
}
function ClauseWalker(root) {
var previous;
var treeWalker = document.createTreeWalker(
root,
NodeFilter.SHOW_ELEMENT,
{
acceptNode: function (node) {
if (previous === node.parentNode) {
return NodeFilter.FILTER_REJECT;
} else {
previous = node;
}
if (node.nodeName === 'EMU-CLAUSE' || node.nodeName === 'EMU-INTRO' || node.nodeName === 'EMU-ANNEX') {
return NodeFilter.FILTER_ACCEPT;
} else {
return NodeFilter.FILTER_SKIP;
}
}
},
false
);
return treeWalker;
}
Menu.prototype.toggle = function () {
this.$menu.classList.toggle('active');
}
Menu.prototype.show = function () {
this.$menu.classList.add('active');
}
Menu.prototype.hide = function () {
this.$menu.classList.remove('active');
}
Menu.prototype.isVisible = function() {
return this.$menu.classList.contains('active');
}
Menu.prototype.showPins = function () {
this.$pins.classList.add('active');
}
Menu.prototype.hidePins = function () {
this.$pins.classList.remove('active');
}
Menu.prototype.addPinEntry = function (id) {
var entry = this.search.biblio.byId[id];
if (!entry) {
// id was deleted after pin (or something) so remove it
delete this._pinnedIds[id];
this.persistPinEntries();
return;
}
if (entry.type === 'clause') {
var prefix;
if (entry.number) {
prefix = entry.number + ' ';
} else {
prefix = '';
}
this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + prefix + entry.titleHTML + '</a></li>';
} else {
this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + entry.key + '</a></li>';
}
if (Object.keys(this._pinnedIds).length === 0) {
this.showPins();
}
this._pinnedIds[id] = true;
this.persistPinEntries();
}
Menu.prototype.removePinEntry = function (id) {
var item = this.$pinList.querySelector('a[href="#' + id + '"]').parentNode;
this.$pinList.removeChild(item);
delete this._pinnedIds[id];
if (Object.keys(this._pinnedIds).length === 0) {
this.hidePins();
}
this.persistPinEntries();
}
Menu.prototype.persistPinEntries = function () {
try {
if (!window.localStorage) return;
} catch (e) {
return;
}
localStorage.pinEntries = JSON.stringify(Object.keys(this._pinnedIds));
}
Menu.prototype.loadPinEntries = function () {
try {
if (!window.localStorage) return;
} catch (e) {
return;
}
var pinsString = window.localStorage.pinEntries;
if (!pinsString) return;
var pins = JSON.parse(pinsString);
for(var i = 0; i < pins.length; i++) {
this.addPinEntry(pins[i]);
}
}
Menu.prototype.togglePinEntry = function (id) {
if (!id) {
id = this.$activeClause[this.$activeClause.length - 1].id;
}
if (this._pinnedIds[id]) {
this.removePinEntry(id);
} else {
this.addPinEntry(id);
}
}
Menu.prototype.selectPin = function (num) {
document.location = this.$pinList.children[num].children[0].href;
}
var menu;
function init() {
menu = new Menu();
var $container = document.getElementById('spec-container');
$container.addEventListener('mouseover', debounce(function (e) {
Toolbox.activateIfMouseOver(e);
}));
}
document.addEventListener('DOMContentLoaded', init);
function debounce(fn, opts) {
opts = opts || {};
var timeout;
return function(e) {
if (opts.stopPropagation) {
e.stopPropagation();
}
var args = arguments;
if (timeout) {
clearTimeout(timeout);
}
timeout = setTimeout(function() {
timeout = null;
fn.apply(this, args);
}.bind(this), 150);
}
}
var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX'];
function findLocalReferences ($elem) {
var name = $elem.innerHTML;
var references = [];
var parentClause = $elem.parentNode;
while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) {
parentClause = parentClause.parentNode;
}
if(!parentClause) return;
var vars = parentClause.querySelectorAll('var');
for (var i = 0; i < vars.length; i++) {
var $var = vars[i];
if ($var.innerHTML === name) {
references.push($var);
}
}
return references;
}
function toggleFindLocalReferences($elem) {
var references = findLocalReferences($elem);
if ($elem.classList.contains('referenced')) {
references.forEach(function ($reference) {
$reference.classList.remove('referenced');
});
} else {
references.forEach(function ($reference) {
$reference.classList.add('referenced');
});
}
}
function installFindLocalReferences () {
document.addEventListener('click', function (e) {
if (e.target.nodeName === 'VAR') {
toggleFindLocalReferences(e.target);
}
});
}
document.addEventListener('DOMContentLoaded', installFindLocalReferences);
// The following license applies to the fuzzysearch function
// The MIT License (MIT)
// Copyright © 2015 Nicolas Bevacqua
// Copyright © 2016 Brian Terlson
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
function fuzzysearch (searchString, haystack, caseInsensitive) {
var tlen = haystack.length;
var qlen = searchString.length;
var chunks = 1;
var finding = false;
var prefix = true;
if (qlen > tlen) {
return false;
}
if (qlen === tlen) {
if (searchString === haystack) {
return { caseMatch: true, chunks: 1, prefix: true };
} else if (searchString.toLowerCase() === haystack.toLowerCase()) {
return { caseMatch: false, chunks: 1, prefix: true };
} else {
return false;
}
}
outer: for (var i = 0, j = 0; i < qlen; i++) {
var nch = searchString[i];
while (j < tlen) {
var targetChar = haystack[j++];
if (targetChar === nch) {
finding = true;
continue outer;
}
if (finding) {
chunks++;
finding = false;
}
}
if (caseInsensitive) { return false }
return fuzzysearch(searchString.toLowerCase(), haystack.toLowerCase(), true);
}
return { caseMatch: !caseInsensitive, chunks: chunks, prefix: j <= qlen };
}
var Toolbox = {
init: function () {
this.$container = document.createElement('div');
this.$container.classList.add('toolbox');
this.$permalink = document.createElement('a');
this.$permalink.textContent = 'Permalink';
this.$pinLink = document.createElement('a');
this.$pinLink.textContent = 'Pin';
this.$pinLink.setAttribute('href', '#');
this.$pinLink.addEventListener('click', function (e) {
e.preventDefault();
e.stopPropagation();
menu.togglePinEntry(this.entry.id);
}.bind(this));
this.$refsLink = document.createElement('a');
this.$refsLink.setAttribute('href', '#');
this.$refsLink.addEventListener('click', function (e) {
e.preventDefault();
e.stopPropagation();
referencePane.showReferencesFor(this.entry);
}.bind(this));
this.$container.appendChild(this.$permalink);
this.$container.appendChild(this.$pinLink);
this.$container.appendChild(this.$refsLink);
document.body.appendChild(this.$container);
},
activate: function (el, entry, target) {
if (el === this._activeEl) return;
this.active = true;
this.entry = entry;
this.$container.classList.add('active');
this.top = el.offsetTop - this.$container.offsetHeight - 10;
this.left = el.offsetLeft;
this.$container.setAttribute('style', 'left: ' + this.left + 'px; top: ' + this.top + 'px');
this.updatePermalink();
this.updateReferences();
this._activeEl = el;
if (this.top < document.body.scrollTop && el === target) {
// don't scroll unless it's a small thing (< 200px)
this.$container.scrollIntoView();
}
},
updatePermalink: function () {
this.$permalink.setAttribute('href', '#' + this.entry.id);
},
updateReferences: function () {
this.$refsLink.textContent = 'References (' + this.entry.referencingIds.length + ')';
},
activateIfMouseOver: function (e) {
var ref = this.findReferenceUnder(e.target);
if (ref && (!this.active || e.pageY > this._activeEl.offsetTop)) {
var entry = menu.search.biblio.byId[ref.id];
this.activate(ref.element, entry, e.target);
} else if (this.active && ((e.pageY < this.top) || e.pageY > (this._activeEl.offsetTop + this._activeEl.offsetHeight))) {
this.deactivate();
}
},
findReferenceUnder: function (el) {
while (el) {
var parent = el.parentNode;
if (el.nodeName === 'H1' && parent.nodeName.match(/EMU-CLAUSE|EMU-ANNEX|EMU-INTRO/) && parent.id) {
return { element: el, id: parent.id };
} else if (el.nodeName.match(/EMU-(?!CLAUSE|XREF|ANNEX|INTRO)|DFN/) &&
el.id && el.id[0] !== '_') {
if (el.nodeName === 'EMU-FIGURE' || el.nodeName === 'EMU-TABLE' || el.nodeName === 'EMU-EXAMPLE') {
// return the figcaption element
return { element: el.children[0].children[0], id: el.id };
} else if (el.nodeName === 'EMU-PRODUCTION') {
// return the LHS non-terminal element
return { element: el.children[0], id: el.id };
} else {
return { element: el, id: el.id };
}
}
el = parent;
}
},
deactivate: function () {
this.$container.classList.remove('active');
this._activeEl = null;
this.activeElBounds = null;
this.active = false;
}
}
var referencePane = {
init: function() {
this.$container = document.createElement('div');
this.$container.setAttribute('id', 'references-pane-container');
var $spacer = document.createElement('div');
$spacer.setAttribute('id', 'references-pane-spacer');
this.$pane = document.createElement('div');
this.$pane.setAttribute('id', 'references-pane');
this.$container.appendChild($spacer);
this.$container.appendChild(this.$pane);
this.$header = document.createElement('div');
this.$header.classList.add('menu-pane-header');
this.$header.textContent = 'References to ';
this.$headerRefId = document.createElement('a');
this.$header.appendChild(this.$headerRefId);
this.$closeButton = document.createElement('span');
this.$closeButton.setAttribute('id', 'references-pane-close');
this.$closeButton.addEventListener('click', function (e) {
this.deactivate();
}.bind(this));
this.$header.appendChild(this.$closeButton);
this.$pane.appendChild(this.$header);
var tableContainer = document.createElement('div');
tableContainer.setAttribute('id', 'references-pane-table-container');
this.$table = document.createElement('table');
this.$table.setAttribute('id', 'references-pane-table');
this.$tableBody = this.$table.createTBody();
tableContainer.appendChild(this.$table);
this.$pane.appendChild(tableContainer);
menu.$specContainer.appendChild(this.$container);
},
activate: function () {
this.$container.classList.add('active');
},
deactivate: function () {
this.$container.classList.remove('active');
},
showReferencesFor(entry) {
this.activate();
var newBody = document.createElement('tbody');
var previousId;
var previousCell;
var dupCount = 0;
this.$headerRefId.textContent = '#' + entry.id;
this.$headerRefId.setAttribute('href', '#' + entry.id);
entry.referencingIds.map(function (id) {
var target = document.getElementById(id);
var cid = findParentClauseId(target);
var clause = menu.search.biblio.byId[cid];
var dupCount = 0;
return { id: id, clause: clause }
}).sort(function (a, b) {
return sortByClauseNumber(a.clause, b.clause);
}).forEach(function (record, i) {
if (previousId === record.clause.id) {
previousCell.innerHTML += ' (<a href="#' + record.id + '">' + (dupCount + 2) + '</a>)';
dupCount++;
} else {
var row = newBody.insertRow();
var cell = row.insertCell();
cell.innerHTML = record.clause.number;
cell = row.insertCell();
cell.innerHTML = '<a href="#' + record.id + '">' + record.clause.titleHTML + '</a>';
previousCell = cell;
previousId = record.clause.id;
dupCount = 0;
}
}, this);
this.$table.removeChild(this.$tableBody);
this.$tableBody = newBody;
this.$table.appendChild(this.$tableBody);
}
}
function findParentClauseId(node) {
while (node && node.nodeName !== 'EMU-CLAUSE' && node.nodeName !== 'EMU-INTRO' && node.nodeName !== 'EMU-ANNEX') {
node = node.parentNode;
}
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function sortByClauseNumber(c1, c2) {
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return 1;
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return 1;
} else if (c1cn < c2cn) {
return -1;
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if (c1c.length === c2c.length) {
return 0;
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return -1;
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document.addEventListener('DOMContentLoaded', function () {
Toolbox.init();
referencePane.init();
})
var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX'];
function findLocalReferences ($elem) {
var name = $elem.innerHTML;
var references = [];
var parentClause = $elem.parentNode;
while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) {
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function toggleFindLocalReferences($elem) {
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references.forEach(function ($reference) {
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function installFindLocalReferences () {
document.addEventListener('click', function (e) {
if (e.target.nodeName === 'VAR') {
toggleFindLocalReferences(e.target);
}
});
}
document.addEventListener('DOMContentLoaded', installFindLocalReferences);
</script><style>body {
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line-height: 1.5;
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#spec-container {
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flex-basis: 66%;
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body.oldtoc {
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a:visited {
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code {
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pre code {
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pre code.hljs {
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ol.toc {
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ol.toc ol.toc {
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var {
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var.referenced {
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emu-val {
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emu-alg ol, emu-alg ol ol ol ol {
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emu-alg ol ol ol, ol ol ol ol ol ol {
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emu-eqn {
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margin-left: 4em;
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emu-eqn.inline {
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margin: 0;
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