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\\t]*(?:\\n|$))[\\s\\S]*?(?:(?:\\n *)+\\n|$))",def:/^ {0,3}\[(label)\]: *(?:\n *)?<?([^\s>]+)>?(?:(?: +(?:\n *)?| *\n *)(title))? *(?:\n+|$)/,table:Q,lheading:/^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,_paragraph:/^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html|table| +\n)[^\n]+)*)/,text:/^[^\n]+/,_label:/(?!\s*\])(?:\\.|[^\[\]\\])+/,_title:/(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/};ie.def=H(ie.def).replace("label",ie._label).replace("title",ie._title).getRegex(),ie.bullet=/(?:[*+-]|\d{1,9}[.)])/,ie.listItemStart=H(/^( *)(bull) */).replace("bull",ie.bullet).getRegex(),ie.list=H(ie.list).replace(/bull/g,ie.bullet).replace("hr","\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))").replace("def","\\n+(?="+ie.def.source+")").getRegex(),ie._tag="address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul",ie._comment=/<!--(?!-?>)[\s\S]*?(?:-->|$)/,ie.html=H(ie.html,"i").replace("comment",ie._comment).replace("tag",ie._tag).replace("attribute",/ +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/).getRegex(),ie.paragraph=H(ie._paragraph).replace("hr",ie.hr).replace("heading"," {0,3}#{1,6} ").replace("|lheading","").replace("|table","").replace("blockquote"," {0,3}>").replace("fences"," {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n").replace("list"," {0,3}(?:[*+-]|1[.)]) ").replace("html","</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|textarea|!--)").replace("tag",ie._tag).getRegex(),ie.blockquote=H(ie.blockquote).replace("paragraph",ie.paragraph).getRegex(),ie.normal=X({},ie),ie.gfm=X({},ie.normal,{table:"^ *([^\\n ].*\\|.*)\\n {0,3}(?:\\| *)?(:?-+:? *(?:\\| *:?-+:? *)*)(?:\\| *)?(?:\\n((?:(?! *\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)"}),ie.gfm.table=H(ie.gfm.table).replace("hr",ie.hr).replace("heading"," {0,3}#{1,6} ").replace("blockquote"," {0,3}>").replace("code"," {4}[^\\n]").replace("fences"," {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n").replace("list"," {0,3}(?:[*+-]|1[.)]) ").replace("html","</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|textarea|!--)").replace("tag",ie._tag).getRegex(),ie.gfm.paragraph=H(ie._paragraph).replace("hr",ie.hr).replace("heading"," {0,3}#{1,6} ").replace("|lheading","").replace("table",ie.gfm.table).replace("blockquote"," {0,3}>").replace("fences"," {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n").replace("list"," {0,3}(?:[*+-]|1[.)]) ").replace("html","</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|textarea|!--)").replace("tag",ie._tag).getRegex(),ie.pedantic=X({},ie.normal,{html:H("^ *(?:comment *(?:\\n|\\s*$)|<(tag)[\\s\\S]+?</\\1> *(?:\\n{2,}|\\s*$)|<tag(?:\"[^\"]*\"|'[^']*'|\\s[^'\"/>\\s]*)*?/?> *(?:\\n{2,}|\\s*$))").replace("comment",ie._comment).replace(/tag/g,"(?!(?:a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)\\b)\\w+(?!:|[^\\w\\s@]*@)\\b").getRegex(),def:/^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +(["(][^\n]+[")]))? *(?:\n+|$)/,heading:/^(#{1,6})(.*)(?:\n+|$)/,fences:Q,paragraph:H(ie.normal._paragraph).replace("hr",ie.hr).replace("heading"," *#{1,6} *[^\n]").replace("lheading",ie.lheading).replace("blockquote"," {0,3}>").replace("|fences","").replace("|list","").replace("|html","").getRegex()});const se={escape:/^\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/,autolink:/^<(scheme:[^\s\x00-\x1f<>]*|email)>/,url:Q,tag:"^comment|^</[a-zA-Z][\\w:-]*\\s*>|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>|^<\\?[\\s\\S]*?\\?>|^<![a-zA-Z]+\\s[\\s\\S]*?>|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>",link:/^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/,reflink:/^!?\[(label)\]\[(ref)\]/,nolink:/^!?\[(ref)\](?:\[\])?/,reflinkSearch:"reflink|nolink(?!\\()",emStrong:{lDelim:/^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,rDelimAst:/^[^_*]*?\_\_[^_*]*?\*[^_*]*?(?=\_\_)|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,rDelimUnd:/^[^_*]*?\*\*[^_*]*?\_[^_*]*?(?=\*\*)|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/},code:/^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,br:/^( {2,}|\\)\n(?!\s*$)/,del:Q,text:/^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,punctuation:/^([\spunctuation])/};function ae(e){return e.replace(/---/g,"—").replace(/--/g,"–").replace(/(^|[-\u2014/(\[{"\s])'/g,"$1‘").replace(/'/g,"’").replace(/(^|[-\u2014/(\[{\u2018\s])"/g,"$1“").replace(/"/g,"”").replace(/\.{3}/g,"…")}function le(e){let t,n,r="";const o=e.length;for(t=0;t<o;t++)n=e.charCodeAt(t),Math.random()>.5&&(n="x"+n.toString(16)),r+="&#"+n+";";return r}se._punctuation="!\"#$%&'()+\\-.,/:;<=>?@\\[\\]`^{|}~",se.punctuation=H(se.punctuation).replace(/punctuation/g,se._punctuation).getRegex(),se.blockSkip=/\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g,se.escapedEmSt=/\\\*|\\_/g,se._comment=H(ie._comment).replace("(?:--\x3e|$)","--\x3e").getRegex(),se.emStrong.lDelim=H(se.emStrong.lDelim).replace(/punct/g,se._punctuation).getRegex(),se.emStrong.rDelimAst=H(se.emStrong.rDelimAst,"g").replace(/punct/g,se._punctuation).getRegex(),se.emStrong.rDelimUnd=H(se.emStrong.rDelimUnd,"g").replace(/punct/g,se._punctuation).getRegex(),se._escapes=/\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g,se._scheme=/[a-zA-Z][a-zA-Z0-9+.-]{1,31}/,se._email=/[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/,se.autolink=H(se.autolink).replace("scheme",se._scheme).replace("email",se._email).getRegex(),se._attribute=/\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/,se.tag=H(se.tag).replace("comment",se._comment).replace("attribute",se._attribute).getRegex(),se._label=/(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/,se._href=/<(?:\\.|[^\n<>\\])+>|[^\s\x00-\x1f]*/,se._title=/"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/,se.link=H(se.link).replace("label",se._label).replace("href",se._href).replace("title",se._title).getRegex(),se.reflink=H(se.reflink).replace("label",se._label).replace("ref",ie._label).getRegex(),se.nolink=H(se.nolink).replace("ref",ie._label).getRegex(),se.reflinkSearch=H(se.reflinkSearch,"g").replace("reflink",se.reflink).replace("nolink",se.nolink).getRegex(),se.normal=X({},se),se.pedantic=X({},se.normal,{strong:{start:/^__|\*\*/,middle:/^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,endAst:/\*\*(?!\*)/g,endUnd:/__(?!_)/g},em:{start:/^_|\*/,middle:/^()\*(?=\S)([\s\S]*?\S)\*(?!\*)|^_(?=\S)([\s\S]*?\S)_(?!_)/,endAst:/\*(?!\*)/g,endUnd:/_(?!_)/g},link:H(/^!?\[(label)\]\((.*?)\)/).replace("label",se._label).getRegex(),reflink:H(/^!?\[(label)\]\s*\[([^\]]*)\]/).replace("label",se._label).getRegex()}),se.gfm=X({},se.normal,{escape:H(se.escape).replace("])","~|])").getRegex(),_extended_email:/[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/,url:/^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,_backpedal:/(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,del:/^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,text:/^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/}),se.gfm.url=H(se.gfm.url,"i").replace("email",se.gfm._extended_email).getRegex(),se.breaks=X({},se.gfm,{br:H(se.br).replace("{2,}","*").getRegex(),text:H(se.gfm.text).replace("\\b_","\\b_| {2,}\\n").replace(/\{2,\}/g,"*").getRegex()});class ce{constructor(e){this.tokens=[],this.tokens.links=Object.create(null),this.options=e||N,this.options.tokenizer=this.options.tokenizer||new oe,this.tokenizer=this.options.tokenizer,this.tokenizer.options=this.options,this.tokenizer.lexer=this,this.inlineQueue=[],this.state={inLink:!1,inRawBlock:!1,top:!0};const t={block:ie.normal,inline:se.normal};this.options.pedantic?(t.block=ie.pedantic,t.inline=se.pedantic):this.options.gfm&&(t.block=ie.gfm,this.options.breaks?t.inline=se.breaks:t.inline=se.gfm),this.tokenizer.rules=t}static get rules(){return{block:ie,inline:se}}static lex(e,t){return new ce(t).lex(e)}static lexInline(e,t){return new ce(t).inlineTokens(e)}lex(e){let t;for(e=e.replace(/\r\n|\r/g,"\n").replace(/\t/g,"    "),this.blockTokens(e,this.tokens);t=this.inlineQueue.shift();)this.inlineTokens(t.src,t.tokens);return this.tokens}blockTokens(e,t=[]){let n,r,o,i;for(this.options.pedantic&&(e=e.replace(/^ +$/gm,""));e;)if(!(this.options.extensions&&this.options.extensions.block&&this.options.extensions.block.some(r=>!!(n=r.call({lexer:this},e,t))&&(e=e.substring(n.raw.length),t.push(n),!0))))if(n=this.tokenizer.space(e))e=e.substring(n.raw.length),1===n.raw.length&&t.length>0?t[t.length-1].raw+="\n":t.push(n);else if(n=this.tokenizer.code(e))e=e.substring(n.raw.length),r=t[t.length-1],!r||"paragraph"!==r.type&&"text"!==r.type?t.push(n):(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue[this.inlineQueue.length-1].src=r.text);else if(n=this.tokenizer.fences(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.heading(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.hr(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.blockquote(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.list(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.html(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.def(e))e=e.substring(n.raw.length),r=t[t.length-1],!r||"paragraph"!==r.type&&"text"!==r.type?this.tokens.links[n.tag]||(this.tokens.links[n.tag]={href:n.href,title:n.title}):(r.raw+="\n"+n.raw,r.text+="\n"+n.raw,this.inlineQueue[this.inlineQueue.length-1].src=r.text);else if(n=this.tokenizer.table(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.lheading(e))e=e.substring(n.raw.length),t.push(n);else{if(o=e,this.options.extensions&&this.options.extensions.startBlock){let t=1/0;const n=e.slice(1);let r;this.options.extensions.startBlock.forEach((function(e){r=e.call({lexer:this},n),"number"==typeof r&&r>=0&&(t=Math.min(t,r))})),t<1/0&&t>=0&&(o=e.substring(0,t+1))}if(this.state.top&&(n=this.tokenizer.paragraph(o)))r=t[t.length-1],i&&"paragraph"===r.type?(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue.pop(),this.inlineQueue[this.inlineQueue.length-1].src=r.text):t.push(n),i=o.length!==e.length,e=e.substring(n.raw.length);else if(n=this.tokenizer.text(e))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===r.type?(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue.pop(),this.inlineQueue[this.inlineQueue.length-1].src=r.text):t.push(n);else if(e){const t="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(t);break}throw new Error(t)}}return this.state.top=!0,t}inline(e,t){this.inlineQueue.push({src:e,tokens:t})}inlineTokens(e,t=[]){let n,r,o,i,s,a,l=e;if(this.tokens.links){const e=Object.keys(this.tokens.links);if(e.length>0)for(;null!=(i=this.tokenizer.rules.inline.reflinkSearch.exec(l));)e.includes(i[0].slice(i[0].lastIndexOf("[")+1,-1))&&(l=l.slice(0,i.index)+"["+ne("a",i[0].length-2)+"]"+l.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex))}for(;null!=(i=this.tokenizer.rules.inline.blockSkip.exec(l));)l=l.slice(0,i.index)+"["+ne("a",i[0].length-2)+"]"+l.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);for(;null!=(i=this.tokenizer.rules.inline.escapedEmSt.exec(l));)l=l.slice(0,i.index)+"++"+l.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);for(;e;)if(s||(a=""),s=!1,!(this.options.extensions&&this.options.extensions.inline&&this.options.extensions.inline.some(r=>!!(n=r.call({lexer:this},e,t))&&(e=e.substring(n.raw.length),t.push(n),!0))))if(n=this.tokenizer.escape(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.tag(e))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===n.type&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(n=this.tokenizer.link(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.reflink(e,this.tokens.links))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===n.type&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(n=this.tokenizer.emStrong(e,l,a))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.codespan(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.br(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.del(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.autolink(e,le))e=e.substring(n.raw.length),t.push(n);else if(this.state.inLink||!(n=this.tokenizer.url(e,le))){if(o=e,this.options.extensions&&this.options.extensions.startInline){let t=1/0;const n=e.slice(1);let 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See the [Self-Review Questionnaire](https://w3ctag.github.io/security-questionnaire/)."}});var vs=Object.freeze({__proto__:null,name:ys,run:function(e){var t;e.lint?.[bs]&&e.isRecTrack&&(t=document,!Array.from(t.querySelectorAll("h2, h3, h4, h5, h6")).some(({textContent:e})=>{const t=/(privacy|security)/im.test(e),n=/(considerations)/im.test(e);return t&&n||t}))&&et(ws.msg,ys,{hint:ws.hint})}});const xs="no-http-props",ks="core/linter-rules/no-http-props",$s=ze({en:{msg:rt`Insecure URLs are not allowed in ${"[respecConfig]"}.`,hint:"Please change the following properties to 'https://': "},zh:{msg:rt`${"[respecConfig]"} 中不允许使用不安全的URL.`,hint:"请将以下属性更改为 https://："}});var _s=Object.freeze({__proto__:null,name:ks,run:function(e){if(!e.lint?.[xs])return;if(!parent.location.href.startsWith("http"))return;const t=Object.getOwnPropertyNames(e).filter(t=>t.endsWith("URI")&&e[t]||"prevED"===t).filter(t=>new URL(e[t],parent.location.href).href.startsWith("http://"));if(t.length){const e=Ie(t,e=>rt`${`[${e}]`}`);et($s.msg,ks,{hint:$s.hint+e})}}}),Es=Object.freeze({__proto__:null,default:'// ReSpec Worker v1.0.0\n"use strict";\ntry {\n  importScripts("https://www.w3.org/Tools/respec/respec-highlight");\n} catch (err) {\n  console.error("Network error loading highlighter", err);\n}\n\nself.addEventListener("message", ({ data: originalData }) => {\n  const data = Object.assign({}, originalData);\n  switch (data.action) {\n    case "highlight-load-lang": {\n      const { langURL, propName, lang } = data;\n      importScripts(langURL);\n      self.hljs.registerLanguage(lang, self[propName]);\n      break;\n    }\n    case "highlight": {\n      const { code } = data;\n      const langs = data.languages.length ? data.languages : undefined;\n      try {\n        const { value, language } = self.hljs.highlightAuto(code, langs);\n        Object.assign(data, { value, language });\n      } catch (err) {\n        console.error("Could not transform some code?", err);\n        // Post back the original code\n        Object.assign(data, { value: code, language: "" });\n      }\n      break;\n    }\n  }\n  self.postMessage(data);\n});\n'}),Ss=Object.freeze({__proto__:null,default:'(() => {\n// @ts-check\nif (document.respec) {\n  document.respec.ready.then(setupPanel);\n} else {\n  setupPanel();\n}\n\nfunction setupPanel() {\n  const listener = panelListener();\n  document.body.addEventListener("keydown", listener);\n  document.body.addEventListener("click", listener);\n}\n\nfunction panelListener() {\n  /** @type {HTMLElement} */\n  let panel = null;\n  return event => {\n    const { target, type } = event;\n\n    if (!(target instanceof HTMLElement)) return;\n\n    // For keys, we only care about Enter key to activate the panel\n    // otherwise it\'s activated via a click.\n    if (type === "keydown" && event.key !== "Enter") return;\n\n    const action = deriveAction(event);\n\n    switch (action) {\n      case "show": {\n        hidePanel(panel);\n        /** @type {HTMLElement} */\n        const dfn = target.closest("dfn, .index-term");\n        panel = document.getElementById(`dfn-panel-for-${dfn.id}`);\n        const coords = deriveCoordinates(event);\n        displayPanel(dfn, panel, coords);\n        break;\n      }\n      case "dock": {\n        panel.style.left = null;\n        panel.style.top = null;\n        panel.classList.add("docked");\n        break;\n      }\n      case "hide": {\n        hidePanel(panel);\n        panel = null;\n        break;\n      }\n    }\n  };\n}\n\n/**\n * @param {MouseEvent|KeyboardEvent} event\n */\nfunction deriveCoordinates(event) {\n  const target = /** @type HTMLElement */ (event.target);\n\n  // We prevent synthetic AT clicks from putting\n  // the dialog in a weird place. The AT events sometimes\n  // lack coordinates, so they have clientX/Y = 0\n  const rect = target.getBoundingClientRect();\n  if (\n    event instanceof MouseEvent &&\n    event.clientX >= rect.left &&\n    event.clientY >= rect.top\n  ) {\n    // The event probably happened inside the bounding rect...\n    return { x: event.clientX, y: event.clientY };\n  }\n\n  // Offset to the middle of the element\n  const x = rect.x + rect.width / 2;\n  // Placed at the bottom of the element\n  const y = rect.y + rect.height;\n  return { x, y };\n}\n\n/**\n * @param {Event} event\n */\nfunction deriveAction(event) {\n  const target = /** @type {HTMLElement} */ (event.target);\n  const hitALink = !!target.closest("a");\n  if (target.closest("dfn:not([data-cite]), .index-term")) {\n    return hitALink ? "none" : "show";\n  }\n  if (target.closest(".dfn-panel")) {\n    if (hitALink) {\n      return target.classList.contains("self-link") ? "hide" : "dock";\n    }\n    const panel = target.closest(".dfn-panel");\n    return panel.classList.contains("docked") ? "hide" : "none";\n  }\n  if (document.querySelector(".dfn-panel:not([hidden])")) {\n    return "hide";\n  }\n  return "none";\n}\n\n/**\n * @param {HTMLElement} dfn\n * @param {HTMLElement} panel\n * @param {{ x: number, y: number }} clickPosition\n */\nfunction displayPanel(dfn, panel, { x, y }) {\n  panel.hidden = false;\n  // distance (px) between edge of panel and the pointing triangle (caret)\n  const MARGIN = 20;\n\n  const dfnRects = dfn.getClientRects();\n  // Find the `top` offset when the `dfn` can be spread across multiple lines\n  let closestTop = 0;\n  let minDiff = Infinity;\n  for (const rect of dfnRects) {\n    const { top, bottom } = rect;\n    const diffFromClickY = Math.abs((top + bottom) / 2 - y);\n    if (diffFromClickY < minDiff) {\n      minDiff = diffFromClickY;\n      closestTop = top;\n    }\n  }\n\n  const top = window.scrollY + closestTop + dfnRects[0].height;\n  const left = x - MARGIN;\n  panel.style.left = `${left}px`;\n  panel.style.top = `${top}px`;\n\n  // Find if the panel is flowing out of the window\n  const panelRect = panel.getBoundingClientRect();\n  const SCREEN_WIDTH = Math.min(window.innerWidth, window.screen.width);\n  if (panelRect.right > SCREEN_WIDTH) {\n    const newLeft = Math.max(MARGIN, x + MARGIN - panelRect.width);\n    const newCaretOffset = left - newLeft;\n    panel.style.left = `${newLeft}px`;\n    /** @type {HTMLElement} */\n    const caret = panel.querySelector(".caret");\n    caret.style.left = `${newCaretOffset}px`;\n  }\n\n  // As it\'s a dialog, we trap focus.\n  // TODO: when <dialog> becomes a implemented, we should really\n  // use that.\n  trapFocus(panel, dfn);\n}\n\n/**\n * @param {HTMLElement} panel\n * @param {HTMLElement} dfn\n * @returns\n */\nfunction trapFocus(panel, dfn) {\n  /** @type NodeListOf<HTMLAnchorElement> elements */\n  const anchors = panel.querySelectorAll("a[href]");\n  // No need to trap focus\n  if (!anchors.length) return;\n\n  // Move focus to first anchor element\n  const first = anchors.item(0);\n  first.focus();\n\n  const trapListener = createTrapListener(anchors, panel, dfn);\n  panel.addEventListener("keydown", trapListener);\n\n  // Hiding the panel releases the trap\n  const mo = new MutationObserver(records => {\n    const [record] = records;\n    const target = /** @type HTMLElement */ (record.target);\n    if (target.hidden) {\n      panel.removeEventListener("keydown", trapListener);\n      mo.disconnect();\n    }\n  });\n  mo.observe(panel, { attributes: true, attributeFilter: ["hidden"] });\n}\n\n/**\n *\n * @param {NodeListOf<HTMLAnchorElement>} anchors\n * @param {HTMLElement} panel\n * @param {HTMLElement} dfn\n * @returns\n */\nfunction createTrapListener(anchors, panel, dfn) {\n  const lastIndex = anchors.length - 1;\n  let currentIndex = 0;\n  return event => {\n    switch (event.key) {\n      // Hitting "Tab" traps us in a nice loop around elements.\n      case "Tab": {\n        event.preventDefault();\n        currentIndex += event.shiftKey ? -1 : +1;\n        if (currentIndex < 0) {\n          currentIndex = lastIndex;\n        } else if (currentIndex > lastIndex) {\n          currentIndex = 0;\n        }\n        anchors.item(currentIndex).focus();\n        break;\n      }\n\n      // Hitting "Enter" on an anchor releases the trap.\n      case "Enter":\n        hidePanel(panel);\n        break;\n\n      // Hitting "Escape" returns focus to dfn.\n      case "Escape":\n        hidePanel(panel);\n        dfn.focus();\n        return;\n    }\n  };\n}\n\n/** @param {HTMLElement} panel */\nfunction hidePanel(panel) {\n  if (!panel) return;\n  panel.hidden = true;\n  panel.classList.remove("docked");\n}\n})()'})}();
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