if I set jQuery 1.9 and jQuery Migrate Plugin in my page, and I use old functions and method (toggle(),jQuery.sub(), .die() and others) wich were in versions before 1.9 and were removed in 1.9,as I know thay will work, but does thay make any problem or bug in older browsers like IE 6/7/8 and old versions of safari,Chrome,Opera,FireFox ?