MediaWiki:Common.js

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

  function saveSidebarScrollPosition() {
    var scrollPosition = document.getElementById(sidebarId).scrollTop;
    sessionStorage.setItem('sidebarScrollPosition', scrollPosition);
  }

  function restoreSidebarScrollPosition() {
    var scrollPosition = sessionStorage.getItem('sidebarScrollPosition');
    if (scrollPosition !== null) {
      document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
    }
  }

  window.addEventListener('beforeunload', saveSidebarScrollPosition);
  window.addEventListener('load', restoreSidebarScrollPosition);

  document.getElementById(sidebarId).addEventListener('click', function (event) {
    if (event.target.tagName === 'A') {
      saveSidebarScrollPosition();
    }
  });
})();