Fix: checking support for the blur() method in iframe on IE. #3938
Fix: checking support for the blur() method in iframe on IE. #3938

floribon/handsontable,littleforeastli/handsontable,littleforeastli/handsontable,littleforeastli/handsontable,floribon/handsontable,rjansen72/handsontable,rjansen72/handsontable,floribon/handsontable