Please add a comment to explain that we need to do this check in order for Aloha Editor to support old versions of IE, which new versions of jQuery will no longer support: 

https://github.com/jquery/jquery/commit/97fa97f0c1cd6a14a0d7f5e2599b30c502bd3e8c#diff-031bb62d959e7e4949d1847c82507f33L676