Chrome/Firefox/Safari auto-update unless a user disables autoupdates which is atypical. As such, most devs will only target the most up-to-date version and mayb

Chrome/Firefox/Safari auto-update unless a user disables autoupdates which is atypical. As such, most devs will only target the most up-to-date version and maybe a single version back (which if something breaks in a single version back, you're already using bleeding edge stuff and probably don't care...) Few devs care for older support unless they're working on enterprise, are masochists, or really really really care about supporting 0.00000001% [0] of their users because they care that much (and more power to them!!) Most devs can point to Microsoft and say "Look, even the guys who created it are no longer supporting it." as an excuse to not support it themselves. I frequently do this when asked to support Safari 5... on Windows. Apple doesn't support it - neither do I. If you work with say.. Healthcare clients you often need to support back to IE7 or even IE6 because that is what they use internally.... [0] I mean to say "practically zero, but not zero percent".