If you write a jQuery application , you do not require to bother with anything as you are creating to a framework/library that does (today) and also will certainly remain to do (in future variations) every little thing under the hood.
as you need not to create your application in one internet browser yet to examine in all various other browsers, and also simples points as opening up home windows and also take care of ajax telephone calls differ from engine to engine ...
so ... please maintain intending to jQuery :) he will certainly do the liquor for you ;)
This tale is totally various for IE. While a lot of the core API such as
Math and also
String coincide, IE varies substantially when it involves the
document object, and also any kind of adjustment therein I would certainly concur with balexandre and also claim that jQuery does a great work at caring for that mess for you.