$(tip).addClass(CLASS_NAME_FADE)\n      }\n\n      const placement = typeof this.config.placement === 'function' ?\n        this.config.placement.call(this, tip, this.element) :\n        this.config.placement\n\n      const attachment = this._getAttachment(placement)\n      this.addAttachmentClass(attachment)\n\n      const container = this._getContainer()\n      $(tip).data(this.constructor.DATA_KEY, this)\n\n      if (!$.contains(this.element.ownerDocument.documentElement, this.tip)) {\n        $(tip).appendTo(container)\n...