All versions of IE (including IE 11) fire focus & blur events asynchronously; we often get bug reports about that: jquery/jquery#trac-13026, jquery/jquery#1758, jquery/jquery#2511 to name just a few.
Thankfully, it was fixed in Microsoft Edge but IE 11 will stay forever as it is.
All versions of IE (including IE 11) fire focus & blur events asynchronously; we often get bug reports about that: jquery/jquery#trac-13026, jquery/jquery#1758, jquery/jquery#2511 to name just a few.
Thankfully, it was fixed in Microsoft Edge but IE 11 will stay forever as it is.
We should document this as one of the things on the "Won't fix" list at https://contribute.jquery.org/wont-fix/