(!isModalOverflowing) {\n        $(this._element).one(Util.TRANSITION_END, () => {\n          this._element.style.overflowY = ''\n        })\n          .emulateTransitionEnd(this._element, modalTransitionDuration)\n      }\n    })\n      .emulateTransitionEnd(modalTransitionDuration)\n    this._element.focus()\n  }\n\n  _showElement(relatedTarget) {\n    const transition = $(this._element).hasClass(CLASS_NAME_FADE)\n    const modalBody = this._dialog ? this._dialog.querySelector(SELECTOR_MODAL_BODY) : null\n\n...