add special transitionend type to test event origin
fixes #13430
Fix regression of #10038 introduced by #13772
Merge pull request #13800 from hnrch02/fix-umd-regression

Fix regression of #10038 introduced by #13772
Merge pull request #13786 from twbs/fat-13430

add special transitionend type to test event origin
some changes from #13801 - add strict mode back and ==