????? ????? ?? ??????? ??? ???????????? ?? ?????????? ??? ?????????? ?????? ??? ?????..??? ??????? ??? ?? ??????????? ??? ?? ????? ???? ??????..????????? ????? ??? ??????????? ???????? ??? ??????? ??? ???????????? ??? ??? ?????? ????.The background system also adjusts the website’s HTML and provides many behaviors working with JavaScript code to