Drupal Association members fund grants that make connections all over the world.
I think we should pick a percentage like 1% as line to decide if we have to add additional browser specific stuff to core.
At this moment we should support. (following the rule with the exception of IE6; see http://gs.statcounter.com/#browser_version-as-monthly-200912-201012)
- chrome 7.0 and higher
- safari 5.0 and higher
- opera 9.5 and higher
- firefox 3.0 and higer
- IE7 and higher