MediaWiki:Common.js

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(function () {
  var sidebarId = 'mw-navigation';

  function saveSidebarScrollPosition() {
    var scrollPosition = document.getElementById(sidebarId).scrollTop;
    var currentPage = window.location.href;
    sessionStorage.setItem(currentPage, scrollPosition);
  }

  function restoreSidebarScrollPosition() {
    var currentPage = window.location.href;
    var scrollPosition = sessionStorage.getItem(currentPage);
    if (scrollPosition !== null) {
      var sidebar = document.getElementById(sidebarId);
      sidebar.scrollTop = parseInt(scrollPosition);
    }
  }

  // Save scroll position when the sidebar is scrolled
  var sidebar = document.getElementById(sidebarId);
  sidebar.addEventListener('scroll', saveSidebarScrollPosition);

  // Restore scroll position when the page is loaded
  window.addEventListener('load', restoreSidebarScrollPosition);

  // Restore scroll position when the history state changes (back/forward navigation)
  window.addEventListener('popstate', restoreSidebarScrollPosition);
})();