MediaWiki:Foreground.js

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/* Collapsible Headers */

var coll = document.getElementsByClassName("c-header");
var i;

for (i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    var content = this.nextElementSibling;
    if (content.style.display === "block") {
      content.style.display = "none";
      if (this.classList.contains("active")) {
         this.class.remove("active");
         this.classList.add("hidden");
      } else {
         this.classList.add("hidden");
      }
    } else {
      content.style.display = "block";
      if (this.classList.contains("hidden")) {
         this.class.remove("hidden");
         this.classList.add("active");
      } else {
         this.classList.add("active");
      }
    }
  });
}