MediaWiki:Common.js

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

/* Custom animated hints: */
  var coll = document.getElementsByClassName("custom-collapsible");
  var i;
  
  for (i = 0; i < coll.length; i++) {
    coll[i].addEventListener("click", function() {
      this.classList.toggle("active");
      var content = this.nextElementSibling;
      if (content.style.maxHeight){
        content.style.maxHeight = null;
      } else {
        content.style.maxHeight = content.scrollHeight + "px";
      } 
    });
  }