Gadget development on mac and windows

We have been developing a gadget for both mac and windows. Its been an interesting experience to say the least.
on the mac we developed on safari/firefox and it worked flowlessly as a mac widget. On windows it was a teeth pulling exercise.
of course the mac widget code did'nt work at all. we developed the code on ie 8, hoping it work as the gadget.
ofcourse it failed miserably. getting css to work on the windows gadget was painfully hard

we wanted to have the exact same codebase for both mac and windows. with same css that works accross both.
it was painful process.

wonder when the day would come when life will be easier for us developer.