Seems their policy is to support the latest or two latest versions of any major browser. Given that IE11 is said version, supporting a version from 3 releases a

Seems their policy is to support the latest or two latest versions of any major browser. Given that IE11 is said version, supporting a version from 3 releases ago (4, if you count Edge) would be pretty strange. Specially since IE releases actually come in a much longer schedule than Chrome or Firefox releases.