New CMSB Responsive Templates: What browsers should we support?
In my experience FF, Chrome, Safari and such play well with CSS3. Users can always upgrade those without the system limitations experienced with older IE versions. The different js libraries referenced in previous posts also help even out some gaps.
We dropped support for IE8 before XP reached it's extended EOL. We're still paying attention to IE9 for now, but mostly IE10 and 11. Honestly, everyone in our office hates "Internet Exploder". We push our clients towards using better browsers like FF and Chrome. Most go for it, but there's always some stubborn ones :) but there are also companies limited by company platforms/IT dept.