MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/* Collapsible headers */

var spoilersc = document.getElementsByClassName('spoilerButton');
    var j;

for (j = 0; j < spoilersc.length; j++) {
  spoilersc[j].addEventListener("click", function() {
    this.classList.toggle("active");
    var spoilercontent = this.nextElementSibling;
    if (spoilercontent.style.display === "block") {
      spoilercontent.style.display = "none";
    } else {
      spoilercontent.style.display = "block";
    }
  });
}

function moveTOC() {
var tocDestination = getElementById("s-toc-content");
var tocContents = getElementById("toc-content");
tocDestination.innerHTML = tocContents;
}

/* Links */

$( document ).ready( function() {
    $( '#p1' ).html( 'New text by jQuery!' );
});

<p id="p1">Hello World!</p>