code: function (active) {
              if (!this._animationsManager) {
                  return this._firstDiv;
              }
              active = !(active === false);
              if (active) {
                  return this._activeDiv === 0 ? this._firstDiv : this._secondDiv;
              } else {
                  return this._activeDiv === 1 ? this._firstDiv : this._secondDiv;
              }
          }
docs: Return the element in which the page is shown right now or the other one, according to the argument
  @param {Boolean} active Whether the active HEMLElement should be returned, namely the element in which the
  page is loaded. It defaults to true
  @return {HTMLElement} Container of a page
  @protected