diff --git a/assets/js/sidebar/sidebar-list.js b/assets/js/sidebar/sidebar-list.js
index bf0d7b634..29b27dbe5 100644
--- a/assets/js/sidebar/sidebar-list.js
+++ b/assets/js/sidebar/sidebar-list.js
@@ -59,6 +59,7 @@ export function initialize () {
       const items = []
       const hasHeaders = Array.isArray(node.headers)
       const translate = hasHeaders ? undefined : 'no'
+      const href = node?.url || `${node.id}.html`
 
       // Group header.
       if (node.group !== group) {
@@ -78,7 +79,7 @@ export function initialize () {
       }
 
       items.push(el('li', {}, [
-        el('a', {href: `${node.id}.html`, translate}, [node.nested_title || node.title]),
+        el('a', {href: href, translate}, [node.nested_title || node.title]),
         ...childList(`node-${node.id}-headers`,
           hasHeaders
             ? renderHeaders(node)
diff --git a/formatters/html/dist/html-5PS32TPG.js b/formatters/html/dist/html-AG646WP7.js
similarity index 91%
rename from formatters/html/dist/html-5PS32TPG.js
rename to formatters/html/dist/html-AG646WP7.js
index b9bf363b2..69c1c993f 100644
--- a/formatters/html/dist/html-5PS32TPG.js
+++ b/formatters/html/dist/html-AG646WP7.js
@@ -1,9 +1,9 @@
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-`,e)},t.Pipeline.load=function(e){var n=new t.Pipeline;return e.forEach(function(r){var i=t.Pipeline.registeredFunctions[r];if(i)n.add(i);else throw new Error("Cannot load unregistered function: "+r)}),n},t.Pipeline.prototype.add=function(){var e=Array.prototype.slice.call(arguments);e.forEach(function(n){t.Pipeline.warnIfFunctionNotRegistered(n),this._stack.push(n)},this)},t.Pipeline.prototype.after=function(e,n){t.Pipeline.warnIfFunctionNotRegistered(n);var r=this._stack.indexOf(e);if(r==-1)throw new Error("Cannot find existingFn");r=r+1,this._stack.splice(r,0,n)},t.Pipeline.prototype.before=function(e,n){t.Pipeline.warnIfFunctionNotRegistered(n);var r=this._stack.indexOf(e);if(r==-1)throw new Error("Cannot find existingFn");this._stack.splice(r,0,n)},t.Pipeline.prototype.remove=function(e){var n=this._stack.indexOf(e);n!=-1&&this._stack.splice(n,1)},t.Pipeline.prototype.run=function(e){for(var n=this._stack.length,r=0;r<n;r++){for(var i=this._stack[r],s=[],o=0;o<e.length;o++){var a=i(e[o],o,e);if(!(a==null||a===""))if(Array.isArray(a))for(var l=0;l<a.length;l++)s.push(a[l]);else s.push(a)}e=s}return e},t.Pipeline.prototype.runString=function(e,n){var r=new t.Token(e,n);return this.run([r]).map(function(i){return i.toString()})},t.Pipeline.prototype.reset=function(){this._stack=[]},t.Pipeline.prototype.toJSON=function(){return this._stack.map(function(e){return t.Pipeline.warnIfFunctionNotRegistered(e),e.label})};t.Vector=function(e){this._magnitude=0,this.elements=e||[]},t.Vector.prototype.positionForIndex=function(e){if(this.elements.length==0)return 0;for(var n=0,r=this.elements.length/2,i=r-n,s=Math.floor(i/2),o=this.elements[s*2];i>1&&(o<e&&(n=s),o>e&&(r=s),o!=e);)i=r-n,s=n+Math.floor(i/2),o=this.elements[s*2];if(o==e||o>e)return s*2;if(o<e)return(s+1)*2},t.Vector.prototype.insert=function(e,n){this.upsert(e,n,function(){throw"duplicate index"})},t.Vector.prototype.upsert=function(e,n,r){this._magnitude=0;var i=this.positionForIndex(e);this.elements[i]==e?this.elements[i+1]=r(this.elements[i+1],n):this.elements.splice(i,0,e,n)},t.Vector.prototype.magnitude=function(){if(this._magnitude)return this._magnitude;for(var e=0,n=this.elements.length,r=1;r<n;r+=2){var i=this.elements[r];e+=i*i}return this._magnitude=Math.sqrt(e)},t.Vector.prototype.dot=function(e){for(var n=0,r=this.elements,i=e.elements,s=r.length,o=i.length,a=0,l=0,u=0,c=0;u<s&&c<o;)a=r[u],l=i[c],a<l?u+=2:a>l?c+=2:a==l&&(n+=r[u+1]*i[c+1],u+=2,c+=2);return n},t.Vector.prototype.similarity=function(e){return this.dot(e)/this.magnitude()||0},t.Vector.prototype.toArray=function(){for(var e=new Array(this.elements.length/2),n=1,r=0;n<this.elements.length;n+=2,r++)e[r]=this.elements[n];return e},t.Vector.prototype.toJSON=function(){return this.elements};t.stemmer=function(){var e={ational:"ate",tional:"tion",enci:"ence",anci:"ance",izer:"ize",bli:"ble",alli:"al",entli:"ent",eli:"e",ousli:"ous",ization:"ize",ation:"ate",ator:"ate",alism:"al",iveness:"ive",fulness:"ful",ousness:"ous",aliti:"al",iviti:"ive",biliti:"ble",logi:"log"},n={icate:"ic",ative:"",alize:"al",iciti:"ic",ical:"ic",ful:"",ness:""},r="[^aeiou]",i="[aeiouy]",s=r+"[^aeiouy]*",o=i+"[aeiou]*",a="^("+s+")?"+o+s,l="^("+s+")?"+o+s+"("+o+")?$",u="^("+s+")?"+o+s+o+s,c="^("+s+")?"+i,d=new RegExp(a),h=new RegExp(u),p=new RegExp(l),m=new RegExp(c),g=/^(.+?)(ss|i)es$/,v=/^(.+?)([^s])s$/,w=/^(.+?)eed$/,x=/^(.+?)(ed|ing)$/,I=/.$/,q=/(at|bl|iz)$/,$=new RegExp("([^aeiouylsz])\\1$"),S=new RegExp("^"+s+i+"[^aeiouwxy]$"),R=/^(.+?[^aeiou])y$/,U=/^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/,ee=/^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/,ve=/^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/,Pe=/^(.+?)(s|t)(ion)$/,te=/^(.+?)e$/,Oe=/ll$/,Ie=new RegExp("^"+s+i+"[^aeiouwxy]$"),ye=function(y){var k,ne,Q,b,T,re,de;if(y.length<3)return y;if(Q=y.substr(0,1),Q=="y"&&(y=Q.toUpperCase()+y.substr(1)),b=g,T=v,b.test(y)?y=y.replace(b,"$1$2"):T.test(y)&&(y=y.replace(T,"$1$2")),b=w,T=x,b.test(y)){var _=b.exec(y);b=d,b.test(_[1])&&(b=I,y=y.replace(b,""))}else if(T.test(y)){var _=T.exec(y);k=_[1],T=m,T.test(k)&&(y=k,T=q,re=$,de=S,T.test(y)?y=y+"e":re.test(y)?(b=I,y=y.replace(b,"")):de.test(y)&&(y=y+"e"))}if(b=R,b.test(y)){var _=b.exec(y);k=_[1],y=k+"i"}if(b=U,b.test(y)){var _=b.exec(y);k=_[1],ne=_[2],b=d,b.test(k)&&(y=k+e[ne])}if(b=ee,b.test(y)){var _=b.exec(y);k=_[1],ne=_[2],b=d,b.test(k)&&(y=k+n[ne])}if(b=ve,T=Pe,b.test(y)){var _=b.exec(y);k=_[1],b=h,b.test(k)&&(y=k)}else if(T.test(y)){var _=T.exec(y);k=_[1]+_[2],T=h,T.test(k)&&(y=k)}if(b=te,b.test(y)){var _=b.exec(y);k=_[1],b=h,T=p,re=Ie,(b.test(k)||T.test(k)&&!re.test(k))&&(y=k)}return b=Oe,T=h,b.test(y)&&T.test(y)&&(b=I,y=y.replace(b,"")),Q=="y"&&(y=Q.toLowerCase()+y.substr(1)),y};return function(ce){return ce.update(ye)}}(),t.Pipeline.registerFunction(t.stemmer,"stemmer");t.generateStopWordFilter=function(e){var n=e.reduce(function(r,i){return r[i]=i,r},{});return function(r){if(r&&n[r.toString()]!==r.toString())return r}},t.stopWordFilter=t.generateStopWordFilter(["a","able","about","across","after","all","almost","also","am","among","an","and","any","are","as","at","be","because","been","but","by","can","cannot","could","dear","did","do","does","either","else","ever","every","for","from","get","got","had","has","have","he","her","hers","him","his","how","however","i","if","in","into","is","it","its","just","least","let","like","likely","may","me","might","most","must","my","neither","no","nor","not","of","off","often","on","only","or","other","our","own","rather","said","say","says","she","should","since","so","some","than","that","the","their","them","then","there","these","they","this","tis","to","too","twas","us","wants","was","we","were","what","when","where","which","while","who","whom","why","will","with","would","yet","you","your"]),t.Pipeline.registerFunction(t.stopWordFilter,"stopWordFilter");t.trimmer=function(e){return e.update(function(n){return n.replace(/^\W+/,"").replace(/\W+$/,"")})},t.Pipeline.registerFunction(t.trimmer,"trimmer");t.TokenSet=function(){this.final=!1,this.edges={},this.id=t.TokenSet._nextId,t.TokenSet._nextId+=1},t.TokenSet._nextId=1,t.TokenSet.fromArray=function(e){for(var n=new t.TokenSet.Builder,r=0,i=e.length;r<i;r++)n.insert(e[r]);return n.finish(),n.root},t.TokenSet.fromClause=function(e){return"editDistance"in e?t.TokenSet.fromFuzzyString(e.term,e.editDistance):t.TokenSet.fromString(e.term)},t.TokenSet.fromFuzzyString=function(e,n){for(var r=new t.TokenSet,i=[{node:r,editsRemaining:n,str:e}];i.length;){var s=i.pop();if(s.str.length>0){var o=s.str.charAt(0),a;o in s.node.edges?a=s.node.edges[o]:(a=new t.TokenSet,s.node.edges[o]=a),s.str.length==1&&(a.final=!0),i.push({node:a,editsRemaining:s.editsRemaining,str:s.str.slice(1)})}if(s.editsRemaining!=0){if("*"in s.node.edges)var l=s.node.edges["*"];else{var l=new t.TokenSet;s.node.edges["*"]=l}if(s.str.length==0&&(l.final=!0),i.push({node:l,editsRemaining:s.editsRemaining-1,str:s.str}),s.str.length>1&&i.push({node:s.node,editsRemaining:s.editsRemaining-1,str:s.str.slice(1)}),s.str.length==1&&(s.node.final=!0),s.str.length>=1){if("*"in s.node.edges)var u=s.node.edges["*"];else{var u=new t.TokenSet;s.node.edges["*"]=u}s.str.length==1&&(u.final=!0),i.push({node:u,editsRemaining:s.editsRemaining-1,str:s.str.slice(1)})}if(s.str.length>1){var c=s.str.charAt(0),d=s.str.charAt(1),h;d in s.node.edges?h=s.node.edges[d]:(h=new t.TokenSet,s.node.edges[d]=h),s.str.length==1&&(h.final=!0),i.push({node:h,editsRemaining:s.editsRemaining-1,str:c+s.str.slice(2)})}}}return r},t.TokenSet.fromString=function(e){for(var n=new t.TokenSet,r=n,i=0,s=e.length;i<s;i++){var o=e[i],a=i==s-1;if(o=="*")n.edges[o]=n,n.final=a;else{var l=new t.TokenSet;l.final=a,n.edges[o]=l,n=l}}return r},t.TokenSet.prototype.toArray=function(){for(var e=[],n=[{prefix:"",node:this}];n.length;){var r=n.pop(),i=Object.keys(r.node.edges),s=i.length;r.node.final&&(r.prefix.charAt(0),e.push(r.prefix));for(var o=0;o<s;o++){var a=i[o];n.push({prefix:r.prefix.concat(a),node:r.node.edges[a]})}}return e},t.TokenSet.prototype.toString=function(){if(this._str)return this._str;for(var e=this.final?"1":"0",n=Object.keys(this.edges).sort(),r=n.length,i=0;i<r;i++){var s=n[i],o=this.edges[s];e=e+s+o.id}return e},t.TokenSet.prototype.intersect=function(e){for(var n=new t.TokenSet,r=void 0,i=[{qNode:e,output:n,node:this}];i.length;){r=i.pop();for(var s=Object.keys(r.qNode.edges),o=s.length,a=Object.keys(r.node.edges),l=a.length,u=0;u<o;u++)for(var c=s[u],d=0;d<l;d++){var h=a[d];if(h==c||c=="*"){var p=r.node.edges[h],m=r.qNode.edges[c],g=p.final&&m.final,v=void 0;h in r.output.edges?(v=r.output.edges[h],v.final=v.final||g):(v=new t.TokenSet,v.final=g,r.output.edges[h]=v),i.push({qNode:m,output:v,node:p})}}}return n},t.TokenSet.Builder=function(){this.previousWord="",this.root=new t.TokenSet,this.uncheckedNodes=[],this.minimizedNodes={}},t.TokenSet.Builder.prototype.insert=function(e){var n,r=0;if(e<this.previousWord)throw new Error("Out of order word insertion");for(var i=0;i<e.length&&i<this.previousWord.length&&e[i]==this.previousWord[i];i++)r++;this.minimize(r),this.uncheckedNodes.length==0?n=this.root:n=this.uncheckedNodes[this.uncheckedNodes.length-1].child;for(var i=r;i<e.length;i++){var s=new t.TokenSet,o=e[i];n.edges[o]=s,this.uncheckedNodes.push({parent:n,char:o,child:s}),n=s}n.final=!0,this.previousWord=e},t.TokenSet.Builder.prototype.finish=function(){this.minimize(0)},t.TokenSet.Builder.prototype.minimize=function(e){for(var n=this.uncheckedNodes.length-1;n>=e;n--){var r=this.uncheckedNodes[n],i=r.child.toString();i in this.minimizedNodes?r.parent.edges[r.char]=this.minimizedNodes[i]:(r.child._str=i,this.minimizedNodes[i]=r.child),this.uncheckedNodes.pop()}};t.Index=function(e){this.invertedIndex=e.invertedIndex,this.fieldVectors=e.fieldVectors,this.tokenSet=e.tokenSet,this.fields=e.fields,this.pipeline=e.pipeline},t.Index.prototype.search=function(e){return this.query(function(n){var r=new t.QueryParser(e,n);r.parse()})},t.Index.prototype.query=function(e){for(var n=new t.Query(this.fields),r=Object.create(null),i=Object.create(null),s=Object.create(null),o=Object.create(null),a=Object.create(null),l=0;l<this.fields.length;l++)i[this.fields[l]]=new t.Vector;e.call(n,n);for(var l=0;l<n.clauses.length;l++){var u=n.clauses[l],c=null,d=t.Set.empty;u.usePipeline?c=this.pipeline.runString(u.term,{fields:u.fields}):c=[u.term];for(var h=0;h<c.length;h++){var p=c[h];u.term=p;var m=t.TokenSet.fromClause(u),g=this.tokenSet.intersect(m).toArray();if(g.length===0&&u.presence===t.Query.presence.REQUIRED){for(var v=0;v<u.fields.length;v++){var w=u.fields[v];o[w]=t.Set.empty}break}for(var x=0;x<g.length;x++)for(var I=g[x],q=this.invertedIndex[I],$=q._index,v=0;v<u.fields.length;v++){var w=u.fields[v],S=q[w],R=Object.keys(S),U=I+"/"+w,ee=new t.Set(R);if(u.presence==t.Query.presence.REQUIRED&&(d=d.union(ee),o[w]===void 0&&(o[w]=t.Set.complete)),u.presence==t.Query.presence.PROHIBITED){a[w]===void 0&&(a[w]=t.Set.empty),a[w]=a[w].union(ee);continue}if(i[w].upsert($,u.boost,function(Ts,_s){return Ts+_s}),!s[U]){for(var ve=0;ve<R.length;ve++){var Pe=R[ve],te=new t.FieldRef(Pe,w),Oe=S[Pe],Ie;(Ie=r[te])===void 0?r[te]=new t.MatchData(I,w,Oe):Ie.add(I,w,Oe)}s[U]=!0}}}if(u.presence===t.Query.presence.REQUIRED)for(var v=0;v<u.fields.length;v++){var w=u.fields[v];o[w]=o[w].intersect(d)}}for(var ye=t.Set.complete,ce=t.Set.empty,l=0;l<this.fields.length;l++){var w=this.fields[l];o[w]&&(ye=ye.intersect(o[w])),a[w]&&(ce=ce.union(a[w]))}var y=Object.keys(r),k=[],ne=Object.create(null);if(n.isNegated()){y=Object.keys(this.fieldVectors);for(var l=0;l<y.length;l++){var te=y[l],Q=t.FieldRef.fromString(te);r[te]=new t.MatchData}}for(var l=0;l<y.length;l++){var Q=t.FieldRef.fromString(y[l]),b=Q.docRef;if(ye.contains(b)&&!ce.contains(b)){var T=this.fieldVectors[Q],re=i[Q.fieldName].similarity(T),de;if((de=ne[b])!==void 0)de.score+=re,de.matchData.combine(r[Q]);else{var _={ref:b,score:re,matchData:r[Q]};ne[b]=_,k.push(_)}}}return k.sort(function(Ss,Ls){return Ls.score-Ss.score})},t.Index.prototype.toJSON=function(){var e=Object.keys(this.invertedIndex).sort().map(function(r){return[r,this.invertedIndex[r]]},this),n=Object.keys(this.fieldVectors).map(function(r){return[r,this.fieldVectors[r].toJSON()]},this);return{version:t.version,fields:this.fields,fieldVectors:n,invertedIndex:e,pipeline:this.pipeline.toJSON()}},t.Index.load=function(e){var n={},r={},i=e.fieldVectors,s=Object.create(null),o=e.invertedIndex,a=new t.TokenSet.Builder,l=t.Pipeline.load(e.pipeline);e.version!=t.version&&t.utils.warn("Version mismatch when loading serialised index. Current version of lunr '"+t.version+"' does not match serialized index '"+e.version+"'");for(var u=0;u<i.length;u++){var c=i[u],d=c[0],h=c[1];r[d]=new t.Vector(h)}for(var u=0;u<o.length;u++){var c=o[u],p=c[0],m=c[1];a.insert(p),s[p]=m}return a.finish(),n.fields=e.fields,n.fieldVectors=r,n.invertedIndex=s,n.tokenSet=a.root,n.pipeline=l,new t.Index(n)};t.Builder=function(){this._ref="id",this._fields=Object.create(null),this._documents=Object.create(null),this.invertedIndex=Object.create(null),this.fieldTermFrequencies={},this.fieldLengths={},this.tokenizer=t.tokenizer,this.pipeline=new t.Pipeline,this.searchPipeline=new t.Pipeline,this.documentCount=0,this._b=.75,this._k1=1.2,this.termIndex=0,this.metadataWhitelist=[]},t.Builder.prototype.ref=function(e){this._ref=e},t.Builder.prototype.field=function(e,n){if(/\//.test(e))throw new RangeError("Field '"+e+"' contains illegal character '/'");this._fields[e]=n||{}},t.Builder.prototype.b=function(e){e<0?this._b=0:e>1?this._b=1:this._b=e},t.Builder.prototype.k1=function(e){this._k1=e},t.Builder.prototype.add=function(e,n){var r=e[this._ref],i=Object.keys(this._fields);this._documents[r]=n||{},this.documentCount+=1;for(var s=0;s<i.length;s++){var o=i[s],a=this._fields[o].extractor,l=a?a(e):e[o],u=this.tokenizer(l,{fields:[o]}),c=this.pipeline.run(u),d=new t.FieldRef(r,o),h=Object.create(null);this.fieldTermFrequencies[d]=h,this.fieldLengths[d]=0,this.fieldLengths[d]+=c.length;for(var p=0;p<c.length;p++){var m=c[p];if(h[m]==null&&(h[m]=0),h[m]+=1,this.invertedIndex[m]==null){var g=Object.create(null);g._index=this.termIndex,this.termIndex+=1;for(var v=0;v<i.length;v++)g[i[v]]=Object.create(null);this.invertedIndex[m]=g}this.invertedIndex[m][o][r]==null&&(this.invertedIndex[m][o][r]=Object.create(null));for(var w=0;w<this.metadataWhitelist.length;w++){var x=this.metadataWhitelist[w],I=m.metadata[x];this.invertedIndex[m][o][r][x]==null&&(this.invertedIndex[m][o][r][x]=[]),this.invertedIndex[m][o][r][x].push(I)}}}},t.Builder.prototype.calculateAverageFieldLengths=function(){for(var e=Object.keys(this.fieldLengths),n=e.length,r={},i={},s=0;s<n;s++){var o=t.FieldRef.fromString(e[s]),a=o.fieldName;i[a]||(i[a]=0),i[a]+=1,r[a]||(r[a]=0),r[a]+=this.fieldLengths[o]}for(var l=Object.keys(this._fields),s=0;s<l.length;s++){var u=l[s];r[u]=r[u]/i[u]}this.averageFieldLength=r},t.Builder.prototype.createFieldVectors=function(){for(var e={},n=Object.keys(this.fieldTermFrequencies),r=n.length,i=Object.create(null),s=0;s<r;s++){for(var o=t.FieldRef.fromString(n[s]),a=o.fieldName,l=this.fieldLengths[o],u=new t.Vector,c=this.fieldTermFrequencies[o],d=Object.keys(c),h=d.length,p=this._fields[a].boost||1,m=this._documents[o.docRef].boost||1,g=0;g<h;g++){var v=d[g],w=c[v],x=this.invertedIndex[v]._index,I,q,$;i[v]===void 0?(I=t.idf(this.invertedIndex[v],this.documentCount),i[v]=I):I=i[v],q=I*((this._k1+1)*w)/(this._k1*(1-this._b+this._b*(l/this.averageFieldLength[a]))+w),q*=p,q*=m,$=Math.round(q*1e3)/1e3,u.insert(x,$)}e[o]=u}this.fieldVectors=e},t.Builder.prototype.createTokenSet=function(){this.tokenSet=t.TokenSet.fromArray(Object.keys(this.invertedIndex).sort())},t.Builder.prototype.build=function(){return this.calculateAverageFieldLengths(),this.createFieldVectors(),this.createTokenSet(),new t.Index({invertedIndex:this.invertedIndex,fieldVectors:this.fieldVectors,tokenSet:this.tokenSet,fields:Object.keys(this._fields),pipeline:this.searchPipeline})},t.Builder.prototype.use=function(e){var n=Array.prototype.slice.call(arguments,1);n.unshift(this),e.apply(this,n)},t.MatchData=function(e,n,r){for(var i=Object.create(null),s=Object.keys(r||{}),o=0;o<s.length;o++){var a=s[o];i[a]=r[a].slice()}this.metadata=Object.create(null),e!==void 0&&(this.metadata[e]=Object.create(null),this.metadata[e][n]=i)},t.MatchData.prototype.combine=function(e){for(var n=Object.keys(e.metadata),r=0;r<n.length;r++){var i=n[r],s=Object.keys(e.metadata[i]);this.metadata[i]==null&&(this.metadata[i]=Object.create(null));for(var o=0;o<s.length;o++){var a=s[o],l=Object.keys(e.metadata[i][a]);this.metadata[i][a]==null&&(this.metadata[i][a]=Object.create(null));for(var u=0;u<l.length;u++){var c=l[u];this.metadata[i][a][c]==null?this.metadata[i][a][c]=e.metadata[i][a][c]:this.metadata[i][a][c]=this.metadata[i][a][c].concat(e.metadata[i][a][c])}}}},t.MatchData.prototype.add=function(e,n,r){if(!(e in this.metadata)){this.metadata[e]=Object.create(null),this.metadata[e][n]=r;return}if(!(n in this.metadata[e])){this.metadata[e][n]=r;return}for(var i=Object.keys(r),s=0;s<i.length;s++){var o=i[s];o in this.metadata[e][n]?this.metadata[e][n][o]=this.metadata[e][n][o].concat(r[o]):this.metadata[e][n][o]=r[o]}},t.Query=function(e){this.clauses=[],this.allFields=e},t.Query.wildcard=new String("*"),t.Query.wildcard.NONE=0,t.Query.wildcard.LEADING=1,t.Query.wildcard.TRAILING=2,t.Query.presence={OPTIONAL:1,REQUIRED:2,PROHIBITED:3},t.Query.prototype.clause=function(e){return"fields"in e||(e.fields=this.allFields),"boost"in e||(e.boost=1),"usePipeline"in e||(e.usePipeline=!0),"wildcard"in e||(e.wildcard=t.Query.wildcard.NONE),e.wildcard&t.Query.wildcard.LEADING&&e.term.charAt(0)!=t.Query.wildcard&&(e.term="*"+e.term),e.wildcard&t.Query.wildcard.TRAILING&&e.term.slice(-1)!=t.Query.wildcard&&(e.term=""+e.term+"*"),"presence"in e||(e.presence=t.Query.presence.OPTIONAL),this.clauses.push(e),this},t.Query.prototype.isNegated=function(){for(var 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n.replace(/^\W+/,"").replace(/\W+$/,"")})},t.Pipeline.registerFunction(t.trimmer,"trimmer");t.TokenSet=function(){this.final=!1,this.edges={},this.id=t.TokenSet._nextId,t.TokenSet._nextId+=1},t.TokenSet._nextId=1,t.TokenSet.fromArray=function(e){for(var n=new t.TokenSet.Builder,r=0,i=e.length;r<i;r++)n.insert(e[r]);return n.finish(),n.root},t.TokenSet.fromClause=function(e){return"editDistance"in e?t.TokenSet.fromFuzzyString(e.term,e.editDistance):t.TokenSet.fromString(e.term)},t.TokenSet.fromFuzzyString=function(e,n){for(var r=new t.TokenSet,i=[{node:r,editsRemaining:n,str:e}];i.length;){var s=i.pop();if(s.str.length>0){var o=s.str.charAt(0),a;o in s.node.edges?a=s.node.edges[o]:(a=new t.TokenSet,s.node.edges[o]=a),s.str.length==1&&(a.final=!0),i.push({node:a,editsRemaining:s.editsRemaining,str:s.str.slice(1)})}if(s.editsRemaining!=0){if("*"in s.node.edges)var l=s.node.edges["*"];else{var l=new t.TokenSet;s.node.edges["*"]=l}if(s.str.length==0&&(l.final=!0),i.push({node:l,editsRemaining:s.editsRemaining-1,str:s.str}),s.str.length>1&&i.push({node:s.node,editsRemaining:s.editsRemaining-1,str:s.str.slice(1)}),s.str.length==1&&(s.node.final=!0),s.str.length>=1){if("*"in s.node.edges)var u=s.node.edges["*"];else{var u=new t.TokenSet;s.node.edges["*"]=u}s.str.length==1&&(u.final=!0),i.push({node:u,editsRemaining:s.editsRemaining-1,str:s.str.slice(1)})}if(s.str.length>1){var c=s.str.charAt(0),d=s.str.charAt(1),h;d in s.node.edges?h=s.node.edges[d]:(h=new t.TokenSet,s.node.edges[d]=h),s.str.length==1&&(h.final=!0),i.push({node:h,editsRemaining:s.editsRemaining-1,str:c+s.str.slice(2)})}}}return r},t.TokenSet.fromString=function(e){for(var n=new t.TokenSet,r=n,i=0,s=e.length;i<s;i++){var o=e[i],a=i==s-1;if(o=="*")n.edges[o]=n,n.final=a;else{var l=new t.TokenSet;l.final=a,n.edges[o]=l,n=l}}return r},t.TokenSet.prototype.toArray=function(){for(var e=[],n=[{prefix:"",node:this}];n.length;){var r=n.pop(),i=Object.keys(r.node.edges),s=i.length;r.node.final&&(r.prefix.charAt(0),e.push(r.prefix));for(var o=0;o<s;o++){var a=i[o];n.push({prefix:r.prefix.concat(a),node:r.node.edges[a]})}}return e},t.TokenSet.prototype.toString=function(){if(this._str)return this._str;for(var e=this.final?"1":"0",n=Object.keys(this.edges).sort(),r=n.length,i=0;i<r;i++){var s=n[i],o=this.edges[s];e=e+s+o.id}return e},t.TokenSet.prototype.intersect=function(e){for(var n=new t.TokenSet,r=void 0,i=[{qNode:e,output:n,node:this}];i.length;){r=i.pop();for(var s=Object.keys(r.qNode.edges),o=s.length,a=Object.keys(r.node.edges),l=a.length,u=0;u<o;u++)for(var c=s[u],d=0;d<l;d++){var h=a[d];if(h==c||c=="*"){var p=r.node.edges[h],g=r.qNode.edges[c],m=p.final&&g.final,v=void 0;h in r.output.edges?(v=r.output.edges[h],v.final=v.final||m):(v=new t.TokenSet,v.final=m,r.output.edges[h]=v),i.push({qNode:g,output:v,node:p})}}}return n},t.TokenSet.Builder=function(){this.previousWord="",this.root=new t.TokenSet,this.uncheckedNodes=[],this.minimizedNodes={}},t.TokenSet.Builder.prototype.insert=function(e){var n,r=0;if(e<this.previousWord)throw new Error("Out of order word insertion");for(var i=0;i<e.length&&i<this.previousWord.length&&e[i]==this.previousWord[i];i++)r++;this.minimize(r),this.uncheckedNodes.length==0?n=this.root:n=this.uncheckedNodes[this.uncheckedNodes.length-1].child;for(var i=r;i<e.length;i++){var s=new t.TokenSet,o=e[i];n.edges[o]=s,this.uncheckedNodes.push({parent:n,char:o,child:s}),n=s}n.final=!0,this.previousWord=e},t.TokenSet.Builder.prototype.finish=function(){this.minimize(0)},t.TokenSet.Builder.prototype.minimize=function(e){for(var n=this.uncheckedNodes.length-1;n>=e;n--){var r=this.uncheckedNodes[n],i=r.child.toString();i in this.minimizedNodes?r.parent.edges[r.char]=this.minimizedNodes[i]:(r.child._str=i,this.minimizedNodes[i]=r.child),this.uncheckedNodes.pop()}};t.Index=function(e){this.invertedIndex=e.invertedIndex,this.fieldVectors=e.fieldVectors,this.tokenSet=e.tokenSet,this.fields=e.fields,this.pipeline=e.pipeline},t.Index.prototype.search=function(e){return this.query(function(n){var r=new t.QueryParser(e,n);r.parse()})},t.Index.prototype.query=function(e){for(var n=new t.Query(this.fields),r=Object.create(null),i=Object.create(null),s=Object.create(null),o=Object.create(null),a=Object.create(null),l=0;l<this.fields.length;l++)i[this.fields[l]]=new t.Vector;e.call(n,n);for(var l=0;l<n.clauses.length;l++){var u=n.clauses[l],c=null,d=t.Set.empty;u.usePipeline?c=this.pipeline.runString(u.term,{fields:u.fields}):c=[u.term];for(var h=0;h<c.length;h++){var p=c[h];u.term=p;var g=t.TokenSet.fromClause(u),m=this.tokenSet.intersect(g).toArray();if(m.length===0&&u.presence===t.Query.presence.REQUIRED){for(var v=0;v<u.fields.length;v++){var w=u.fields[v];o[w]=t.Set.empty}break}for(var x=0;x<m.length;x++)for(var P=m[x],q=this.invertedIndex[P],$=q._index,v=0;v<u.fields.length;v++){var w=u.fields[v],S=q[w],R=Object.keys(S),U=P+"/"+w,ee=new t.Set(R);if(u.presence==t.Query.presence.REQUIRED&&(d=d.union(ee),o[w]===void 0&&(o[w]=t.Set.complete)),u.presence==t.Query.presence.PROHIBITED){a[w]===void 0&&(a[w]=t.Set.empty),a[w]=a[w].union(ee);continue}if(i[w].upsert($,u.boost,function(Ts,_s){return Ts+_s}),!s[U]){for(var ve=0;ve<R.length;ve++){var Pe=R[ve],te=new t.FieldRef(Pe,w),Oe=S[Pe],Ie;(Ie=r[te])===void 0?r[te]=new t.MatchData(P,w,Oe):Ie.add(P,w,Oe)}s[U]=!0}}}if(u.presence===t.Query.presence.REQUIRED)for(var v=0;v<u.fields.length;v++){var w=u.fields[v];o[w]=o[w].intersect(d)}}for(var ye=t.Set.complete,ce=t.Set.empty,l=0;l<this.fields.length;l++){var w=this.fields[l];o[w]&&(ye=ye.intersect(o[w])),a[w]&&(ce=ce.union(a[w]))}var y=Object.keys(r),k=[],ne=Object.create(null);if(n.isNegated()){y=Object.keys(this.fieldVectors);for(var l=0;l<y.length;l++){var te=y[l],Q=t.FieldRef.fromString(te);r[te]=new t.MatchData}}for(var l=0;l<y.length;l++){var Q=t.FieldRef.fromString(y[l]),b=Q.docRef;if(ye.contains(b)&&!ce.contains(b)){var T=this.fieldVectors[Q],re=i[Q.fieldName].similarity(T),de;if((de=ne[b])!==void 0)de.score+=re,de.matchData.combine(r[Q]);else{var _={ref:b,score:re,matchData:r[Q]};ne[b]=_,k.push(_)}}}return k.sort(function(Ss,Ls){return Ls.score-Ss.score})},t.Index.prototype.toJSON=function(){var e=Object.keys(this.invertedIndex).sort().map(function(r){return[r,this.invertedIndex[r]]},this),n=Object.keys(this.fieldVectors).map(function(r){return[r,this.fieldVectors[r].toJSON()]},this);return{version:t.version,fields:this.fields,fieldVectors:n,invertedIndex:e,pipeline:this.pipeline.toJSON()}},t.Index.load=function(e){var n={},r={},i=e.fieldVectors,s=Object.create(null),o=e.invertedIndex,a=new t.TokenSet.Builder,l=t.Pipeline.load(e.pipeline);e.version!=t.version&&t.utils.warn("Version mismatch when loading serialised index. Current version of lunr '"+t.version+"' does not match serialized index '"+e.version+"'");for(var u=0;u<i.length;u++){var c=i[u],d=c[0],h=c[1];r[d]=new t.Vector(h)}for(var u=0;u<o.length;u++){var c=o[u],p=c[0],g=c[1];a.insert(p),s[p]=g}return a.finish(),n.fields=e.fields,n.fieldVectors=r,n.invertedIndex=s,n.tokenSet=a.root,n.pipeline=l,new t.Index(n)};t.Builder=function(){this._ref="id",this._fields=Object.create(null),this._documents=Object.create(null),this.invertedIndex=Object.create(null),this.fieldTermFrequencies={},this.fieldLengths={},this.tokenizer=t.tokenizer,this.pipeline=new t.Pipeline,this.searchPipeline=new t.Pipeline,this.documentCount=0,this._b=.75,this._k1=1.2,this.termIndex=0,this.metadataWhitelist=[]},t.Builder.prototype.ref=function(e){this._ref=e},t.Builder.prototype.field=function(e,n){if(/\//.test(e))throw new RangeError("Field '"+e+"' contains illegal character '/'");this._fields[e]=n||{}},t.Builder.prototype.b=function(e){e<0?this._b=0:e>1?this._b=1:this._b=e},t.Builder.prototype.k1=function(e){this._k1=e},t.Builder.prototype.add=function(e,n){var r=e[this._ref],i=Object.keys(this._fields);this._documents[r]=n||{},this.documentCount+=1;for(var s=0;s<i.length;s++){var o=i[s],a=this._fields[o].extractor,l=a?a(e):e[o],u=this.tokenizer(l,{fields:[o]}),c=this.pipeline.run(u),d=new t.FieldRef(r,o),h=Object.create(null);this.fieldTermFrequencies[d]=h,this.fieldLengths[d]=0,this.fieldLengths[d]+=c.length;for(var p=0;p<c.length;p++){var g=c[p];if(h[g]==null&&(h[g]=0),h[g]+=1,this.invertedIndex[g]==null){var m=Object.create(null);m._index=this.termIndex,this.termIndex+=1;for(var v=0;v<i.length;v++)m[i[v]]=Object.create(null);this.invertedIndex[g]=m}this.invertedIndex[g][o][r]==null&&(this.invertedIndex[g][o][r]=Object.create(null));for(var w=0;w<this.metadataWhitelist.length;w++){var x=this.metadataWhitelist[w],P=g.metadata[x];this.invertedIndex[g][o][r][x]==null&&(this.invertedIndex[g][o][r][x]=[]),this.invertedIndex[g][o][r][x].push(P)}}}},t.Builder.prototype.calculateAverageFieldLengths=function(){for(var e=Object.keys(this.fieldLengths),n=e.length,r={},i={},s=0;s<n;s++){var o=t.FieldRef.fromString(e[s]),a=o.fieldName;i[a]||(i[a]=0),i[a]+=1,r[a]||(r[a]=0),r[a]+=this.fieldLengths[o]}for(var l=Object.keys(this._fields),s=0;s<l.length;s++){var u=l[s];r[u]=r[u]/i[u]}this.averageFieldLength=r},t.Builder.prototype.createFieldVectors=function(){for(var e={},n=Object.keys(this.fieldTermFrequencies),r=n.length,i=Object.create(null),s=0;s<r;s++){for(var o=t.FieldRef.fromString(n[s]),a=o.fieldName,l=this.fieldLengths[o],u=new t.Vector,c=this.fieldTermFrequencies[o],d=Object.keys(c),h=d.length,p=this._fields[a].boost||1,g=this._documents[o.docRef].boost||1,m=0;m<h;m++){var v=d[m],w=c[v],x=this.invertedIndex[v]._index,P,q,$;i[v]===void 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this.metadata[e][n]?this.metadata[e][n][o]=this.metadata[e][n][o].concat(r[o]):this.metadata[e][n][o]=r[o]}},t.Query=function(e){this.clauses=[],this.allFields=e},t.Query.wildcard=new String("*"),t.Query.wildcard.NONE=0,t.Query.wildcard.LEADING=1,t.Query.wildcard.TRAILING=2,t.Query.presence={OPTIONAL:1,REQUIRED:2,PROHIBITED:3},t.Query.prototype.clause=function(e){return"fields"in e||(e.fields=this.allFields),"boost"in e||(e.boost=1),"usePipeline"in e||(e.usePipeline=!0),"wildcard"in e||(e.wildcard=t.Query.wildcard.NONE),e.wildcard&t.Query.wildcard.LEADING&&e.term.charAt(0)!=t.Query.wildcard&&(e.term="*"+e.term),e.wildcard&t.Query.wildcard.TRAILING&&e.term.slice(-1)!=t.Query.wildcard&&(e.term=""+e.term+"*"),"presence"in e||(e.presence=t.Query.presence.OPTIONAL),this.clauses.push(e),this},t.Query.prototype.isNegated=function(){for(var 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Wn}mount(){this.swup.hooks.create("content:announce"),this.swup.hooks.create("content:focus"),this.before("visit:start",this.prepareVisit),this.on("visit:start",this.markAsBusy),this.on("visit:end",this.unmarkAsBusy),this.on("visit:end",this.focusContent),this.on("visit:end",this.announceContent),this.on("scroll:anchor",this.handleAnchorScroll),this.before("visit:start",this.disableAnimations),this.before("link:self",this.disableAnimations),this.before("link:anchor",this.disableAnimations),this.swup.announce=this.announce.bind(this)}unmount(){this.swup.announce=void 0}async announce(e){await this.announcer.announce(e)}markAsBusy(){document.documentElement.setAttribute("aria-busy","true")}unmarkAsBusy(){document.documentElement.removeAttribute("aria-busy")}prepareVisit(e){e.a11y={announce:void 0,focus:this.rootSelector}}announceContent(e){this.swup.hooks.callSync("content:announce",e,void 0,n=>{n.a11y.announce===void 0&&(n.a11y.announce=this.getPageAnnouncement()),n.a11y.announce&&this.announcer.announce(n.a11y.announce,this.announcementDelay)})}focusContent(e){this.swup.hooks.callSync("content:focus",e,void 0,n=>{n.a11y.focus&&(this.options.autofocus&&function(){let r=function(){let i=document.querySelector("body [autofocus]");if(i&&!i.closest('[inert], [aria-disabled], [aria-hidden="true"]'))return i}();return!!r&&(r!==document.activeElement&&r.focus(),!0)}()===!0||xs(n.a11y.focus))})}getPageAnnouncement(){let{headingSelector:e,announcements:n}=this.options;return function({headingSelector:r="h1",announcements:i={}}){var s,o;let a=document.documentElement.lang||"*",{href:l,url:u,pathname:c}=I.fromUrl(window.location.href),d=(s=(o=i[a])!=null?o:i["*"])!=null?s:i;if(typeof d!="object")return;let h=document.querySelector(r);h||console.warn(`SwupA11yPlugin: No main heading (${r}) found on new page`);let p=h?.getAttribute("aria-label")||h?.textContent||document.title||Es(d.url,{href:l,url:u,path:c});return Es(d.visit,{title:p,href:l,url:u,path:c})}({headingSelector:e,announcements:n})}disableAnimations(e){this.options.respectReducedMotion&&window.matchMedia("(prefers-reduced-motion: reduce)").matches&&(e.animation.animate=!1,e.scroll.animate=!1)}};function zn(){return zn=Object.assign?Object.assign.bind():function(t){for(var e=1;e<arguments.length;e++){var n=arguments[e];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(t[r]=n[r])}return t},zn.apply(this,arguments)}var Gn=class{constructor({className:e,styleAttr:n,animationDuration:r,minValue:i,initialValue:s,trickleValue:o}={}){this.value=0,this.visible=!1,this.hiding=!1,this.className="progress-bar",this.styleAttr="data-progressbar-styles data-swup-theme",this.animationDuration=300,this.minValue=.1,this.initialValue=.25,this.trickleValue=.03,this.trickleInterval=void 0,this.styleElement=void 0,this.progressElement=void 0,this.trickle=()=>{let a=Math.random()*this.trickleValue;this.setValue(this.value+a)},e!==void 0&&(this.className=String(e)),n!==void 0&&(this.styleAttr=String(n)),r!==void 0&&(this.animationDuration=Number(r)),i!==void 0&&(this.minValue=Number(i)),s!==void 0&&(this.initialValue=Number(s)),o!==void 0&&(this.trickleValue=Number(o)),this.styleElement=this.createStyleElement(),this.progressElement=this.createProgressElement()}get defaultStyles(){return`
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diff --git a/lib/ex_doc/formatter/epub.ex b/lib/ex_doc/formatter/epub.ex
index 338cc497e..a5ec444a9 100644
--- a/lib/ex_doc/formatter/epub.ex
+++ b/lib/ex_doc/formatter/epub.ex
@@ -61,17 +61,17 @@ defmodule ExDoc.Formatter.EPUB do
   end
 
   defp generate_extras(config) do
-    for {_title, extras} <- config.extras do
-      Enum.each(extras, fn %{id: id, title: title, title_content: title_content, content: content} ->
-        output = "#{config.output}/OEBPS/#{id}.xhtml"
-        html = Templates.extra_template(config, title, title_content, content)
-
-        if File.regular?(output) do
-          Utils.warn("file #{Path.relative_to_cwd(output)} already exists", [])
-        end
+    for {_title, extras} <- config.extras,
+        %{id: id, title: title, title_content: title_content, content: content} <- extras,
+        not is_map_key(extras, :url) do
+      output = "#{config.output}/OEBPS/#{id}.xhtml"
+      html = Templates.extra_template(config, title, title_content, content)
+
+      if File.regular?(output) do
+        Utils.warn("file #{Path.relative_to_cwd(output)} already exists", [])
+      end
 
-        File.write!(output, html)
-      end)
+      File.write!(output, html)
     end
   end
 
diff --git a/lib/ex_doc/formatter/html.ex b/lib/ex_doc/formatter/html.ex
index bdc3420e8..060051777 100644
--- a/lib/ex_doc/formatter/html.ex
+++ b/lib/ex_doc/formatter/html.ex
@@ -209,6 +209,7 @@ defmodule ExDoc.Formatter.HTML do
   defp generate_extras(extras, config) do
     generated_extras =
       extras
+      |> Enum.reject(&is_map_key(&1, :url))
       |> with_prev_next()
       |> Enum.map(fn {node, prev, next} ->
         filename = "#{node.id}.html"
@@ -349,6 +350,7 @@ defmodule ExDoc.Formatter.HTML do
 
     extras =
       config.extras
+      |> Enum.map(&normalize_extras/1)
       |> Task.async_stream(
         &build_extra(&1, groups, language, autolink_opts, source_url_pattern),
         timeout: :infinity
@@ -384,10 +386,21 @@ defmodule ExDoc.Formatter.HTML do
     end)
   end
 
+  defp normalize_extras(base) when is_binary(base), do: {base, %{}}
+  defp normalize_extras({base, opts}), do: {base, Map.new(opts)}
+
   defp disambiguate_id(extra, discriminator) do
     Map.put(extra, :id, "#{extra.id}-#{discriminator}")
   end
 
+  defp build_extra({input, %{url: _} = input_options}, groups, _lang, _auto, _url_pattern) do
+    input = to_string(input)
+    title = input_options[:title] || filename_to_title(input)
+    group = GroupMatcher.match_extra(groups, input)
+
+    %{group: group, id: Utils.text_to_id(title), title: title, url: input_options[:url]}
+  end
+
   defp build_extra({input, input_options}, groups, language, autolink_opts, source_url_pattern) do
     input = to_string(input)
     id = input_options[:filename] || input |> filename_to_title() |> Utils.text_to_id()
@@ -447,10 +460,6 @@ defmodule ExDoc.Formatter.HTML do
     }
   end
 
-  defp build_extra(input, groups, language, autolink_opts, source_url_pattern) do
-    build_extra({input, []}, groups, language, autolink_opts, source_url_pattern)
-  end
-
   defp normalize_search_data!(nil), do: nil
 
   defp normalize_search_data!(search_data) when is_list(search_data) do
@@ -595,14 +604,21 @@ defmodule ExDoc.Formatter.HTML do
   end
 
   defp extra_paths(config) do
-    Map.new(config.extras, fn
-      path when is_binary(path) ->
+    Enum.reduce(config.extras, %{}, fn
+      path, acc when is_binary(path) ->
         base = Path.basename(path)
-        {base, Utils.text_to_id(Path.rootname(base))}
 
-      {path, opts} ->
-        base = path |> to_string() |> Path.basename()
-        {base, opts[:filename] || Utils.text_to_id(Path.rootname(base))}
+        Map.put(acc, base, Utils.text_to_id(Path.rootname(base)))
+
+      {path, opts}, acc ->
+        if Keyword.has_key?(opts, :url) do
+          acc
+        else
+          base = path |> to_string() |> Path.basename()
+          name = Keyword.get_lazy(opts, :filename, fn -> Utils.text_to_id(Path.rootname(base)) end)
+
+          Map.put(acc, base, name)
+        end
     end)
   end
 end
diff --git a/lib/ex_doc/formatter/html/search_data.ex b/lib/ex_doc/formatter/html/search_data.ex
index 967ee4526..9645d260f 100644
--- a/lib/ex_doc/formatter/html/search_data.ex
+++ b/lib/ex_doc/formatter/html/search_data.ex
@@ -18,36 +18,8 @@ defmodule ExDoc.Formatter.HTML.SearchData do
     ["searchData=" | ExDoc.Utils.to_json(data)]
   end
 
-  defp extra(map) do
-    if custom_search_data = map[:search_data] do
-      extra_search_data(map, custom_search_data)
-    else
-      {intro, sections} = extract_sections_from_markdown(map.source)
-
-      intro_json_item =
-        encode(
-          "#{map.id}.html",
-          map.title,
-          :extras,
-          intro
-        )
-
-      section_json_items =
-        for {header, body} <- sections do
-          encode(
-            "#{map.id}.html##{Utils.text_to_id(header)}",
-            header <> " - #{map.title}",
-            :extras,
-            body
-          )
-        end
-
-      [intro_json_item | section_json_items]
-    end
-  end
-
-  defp extra_search_data(map, custom_search_data) do
-    Enum.map(custom_search_data, fn item ->
+  defp extra(%{search_data: search_data} = map) when is_list(search_data) do
+    Enum.map(search_data, fn item ->
       link =
         if item.anchor === "" do
           "#{map.id}.html"
@@ -59,6 +31,34 @@ defmodule ExDoc.Formatter.HTML.SearchData do
     end)
   end
 
+  defp extra(%{url: url} = map) do
+    [encode("#{map.id}", map.title, :extras, url)]
+  end
+
+  defp extra(map) do
+    {intro, sections} = extract_sections_from_markdown(map.source)
+
+    intro_json_item =
+      encode(
+        "#{map.id}.html",
+        map.title,
+        :extras,
+        intro
+      )
+
+    section_json_items =
+      for {header, body} <- sections do
+        encode(
+          "#{map.id}.html##{Utils.text_to_id(header)}",
+          header <> " - #{map.title}",
+          :extras,
+          body
+        )
+      end
+
+    [intro_json_item | section_json_items]
+  end
+
   defp module(%ExDoc.ModuleNode{} = node) do
     {intro, sections} = extract_sections(node.doc_format, node)
 
diff --git a/lib/ex_doc/formatter/html/templates.ex b/lib/ex_doc/formatter/html/templates.ex
index 80d180548..f6805f203 100644
--- a/lib/ex_doc/formatter/html/templates.ex
+++ b/lib/ex_doc/formatter/html/templates.ex
@@ -58,15 +58,9 @@ defmodule ExDoc.Formatter.HTML.Templates do
 
   defp sidebar_extras(extras) do
     for extra <- extras do
-      %{id: id, title: title, group: group, content: content} = extra
+      %{id: id, title: title, group: group} = extra
 
-      item =
-        %{
-          id: to_string(id),
-          title: to_string(title),
-          group: to_string(group),
-          headers: extract_headers(content)
-        }
+      item = %{id: to_string(id), title: to_string(title), group: to_string(group)}
 
       case extra do
         %{search_data: search_data} when is_list(search_data) ->
@@ -79,10 +73,15 @@ defmodule ExDoc.Formatter.HTML.Templates do
               }
             end)
 
-          Map.put(item, :searchData, search_data)
+          item
+          |> Map.put(:headers, extract_headers(extra.content))
+          |> Map.put(:searchData, search_data)
+
+        %{url: url} when is_binary(url) ->
+          Map.put(item, :url, url)
 
         _ ->
-          item
+          Map.put(item, :headers, extract_headers(extra.content))
       end
     end
   end
diff --git a/lib/mix/tasks/docs.ex b/lib/mix/tasks/docs.ex
index c9bc1f808..91d6a61e4 100644
--- a/lib/mix/tasks/docs.ex
+++ b/lib/mix/tasks/docs.ex
@@ -111,11 +111,12 @@ defmodule Mix.Tasks.Docs do
       Markdown and plain text pages; default: "PAGES". Example: "GUIDES"
 
     * `:extras` - List of paths to additional Markdown (`.md` extension), Live Markdown
-      (`.livemd` extension), Cheatsheets (`.cheatmd` extension) and plain text pages to
-      add to the documentation. You can also specify keyword pairs to customize the
-      generated filename, title and source file, and search content of each extra page; default: `[]`. Example:
-      `["README.md", "LICENSE", "CONTRIBUTING.md": [filename: "contributing", title: "Contributing", source: "CONTRIBUTING.mdx"]]`
-      See the Customizing Extras section for more.
+      (`.livemd` extension), Cheatsheets (`.cheatmd` extension), external urls (`:url` option),
+      and plain text pages to add to the documentation. You can also specify keyword pairs to
+      customize the generated filename, title and source file, and search content of each extra page;
+      default: `[]`. Example: `["README.md", "LICENSE", "CONTRIBUTING.md": [filename: "contributing",
+      title: "Contributing", source: "CONTRIBUTING.mdx"]]` See the Customizing Extras section for
+      more.
 
     * `:favicon` - Path to a favicon image file for the project. Must be PNG, JPEG or SVG. When
       specified, the image file will be placed in the output "assets" directory, named
@@ -378,6 +379,7 @@ defmodule Mix.Tasks.Docs do
        title but keep the source file unchanged.
     * `:search_data` - A list of terms to be indexed for autocomplete and search. If not provided, the content
        of the extra page will be indexed for search. See the section below for more.
+    * `:url` - An external url to link to from the sidebar.
 
   ### Customizing Search Data
 
diff --git a/test/ex_doc/formatter/epub_test.exs b/test/ex_doc/formatter/epub_test.exs
index b54b78801..c9ef84a94 100644
--- a/test/ex_doc/formatter/epub_test.exs
+++ b/test/ex_doc/formatter/epub_test.exs
@@ -146,6 +146,17 @@ defmodule ExDoc.Formatter.EPUBTest do
     assert content =~ ~r{<li><a href="readme.xhtml">README</a></li>}
   end
 
+  test "ignores any external url extras", %{tmp_dir: tmp_dir} = context do
+    config =
+      context
+      |> doc_config()
+      |> Keyword.put(:extras, [elixir: [url: "https://elixir-lang.org"]])
+
+    generate_docs_and_unzip(context, config)
+
+    refute File.exists?(tmp_dir <> "/epub/OEBPS/elixir.xhtml")
+  end
+
   test "uses samp as highlight tag for markdown", %{tmp_dir: tmp_dir} = context do
     generate_docs_and_unzip(context, doc_config(context))
 
diff --git a/test/ex_doc/formatter/html_test.exs b/test/ex_doc/formatter/html_test.exs
index fc31e4d70..08ea312ab 100644
--- a/test/ex_doc/formatter/html_test.exs
+++ b/test/ex_doc/formatter/html_test.exs
@@ -112,6 +112,24 @@ defmodule ExDoc.Formatter.HTMLTest do
     assert LazyHTML.text(bar_content["h1"]) == "README bar"
   end
 
+  test "extras defined as external urls", %{tmp_dir: tmp_dir} = context do
+    config =
+      doc_config(context,
+        extras: [
+          "README.md",
+          "Elixir": [url: "https://elixir-lang.org"]
+        ]
+      )
+
+    File.write!("#{tmp_dir}/README.md", "README")
+
+    generate_docs(config)
+
+    content = File.read!(tmp_dir <> "/html/README.html")
+
+    assert content =~ "https://elixir-lang.org"
+  end
+
   test "warns when generating an index.html file with an invalid redirect",
        %{tmp_dir: tmp_dir} = context do
     output =