MediaWiki:Gadgets-definition

/**

* Auto-number headings
*
* @source https://www.mediawiki.org/wiki/Snippets/Auto-number_headings
* @author Krinkle
* @version 2021-10-03
*/

var toc = document.querySelector('#toc'); if (toc) {

 document.querySelectorAll('.mw-parser-output :is(h1,h2,h3,h4,h5,h6) .mw-headline').forEach(function (headline) {
   var num = toc.querySelector('a[href="#' + CSS.escape(headline.id) + '"] .tocnumber');
   if (num) headline.prepend(num.textContent + ' ');
 });

} else {

 document.body.classList.add('tpl-autonum');

}