W3Schools is optimized for Mastering and education. Examples might be simplified to improve reading through and Finding out. ????? ?????? ??????? ?????????? ???? ?????? ????????? ??????? ??????? ???? ??????? ??????? ?????? ??????? ??? ????? ?????????? ?????? ????????? ?????????????? ???????? ????? ???? ???????? ???? ?????????? ??????????? ?????