User:Rublov/leadcaps.js

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 /**
  * Highlights the bolded title in the lead if it does not match the
  * capitalization of the actual page title.
  *
  * Written by [[User:Rublov]], January 2022
  *
  * This script is developed on GitHub: https://github.com/rublovwiki/scripts
  */

 $(function(){
 if(!isMainspace()){
 return;
 }

 consttitleElement=getTitleElement();

 constleadTitle=(titleElement?titleElement.textContent:"").trim();
 constarticleTitle=getArticleTitle().trim();

 // Ignore first letter, which may be lower-case in running text but otherwise
 // match the title.
 if(differsOnlyInCase(leadTitle.slice(1),articleTitle.slice(1))){
 highlightElement(titleElement);

 // Unhighlight the element when clicked.
 titleElement.addEventListener("click",()=>{
 unHighlightElement(titleElement);
 });
 }
 });

 functionisMainspace(){
 returnmw.config.get("wgCanonicalNamespace")==="";
 }

 functiongetTitleElement(){
 // Return the first bolded element in the first paragraph of the article's
 // text. Not fool-proof, but generally matches the bolded title in the lead.
 returndocument.querySelector("#mw-content-text p b");
 }

 functiongetArticleTitle(){
 returnmw.config.get("wgTitle");
 }

 functionhighlightElement(e){
 e.style.color="red";
 }

 functionunHighlightElement(e){
 e.style.color="initial";
 }

 functiondiffersOnlyInCase(s1,s2){
 returns1!==s2&&s1.toLowerCase()===s2.toLowerCase();
 }

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