217061 2020-09-28 11:53:51 -0700 onTransitionEnd buggy on devices using iOS 14 2020-10-19 06:40:00 -0700 1 1 1 Unclassified WebKit Animations Safari 14 iPhone / iPad Other RESOLVED DUPLICATE 215655 InRadar P2 Critical --- 1 nicolekinser21 webkit-unassigned dino graouts graouts webkit-bug-importer oldest_to_newest 1692629 0 nicolekinser21 2020-09-28 11:53:51 -0700 There's a bug only on iOS14 devices where onTransitionEnd is not being consistently called. The react-dates calendar (an open source calendar) uses onTransitionEnd to update calendar state when a month transition occurs, and on iOS14 onTransitionEnd is called correctly the first two times the navigation buttons are pressed but then it stops being called for subsequent clicks. You can see an example of the calendar here (https://airbnb.io/react-dates/?path=/story/daypicker--default) and this is the onTransitionEnd that is not working correctly (https://github.com/airbnb/react-dates/blob/master/src/components/CalendarMonthGrid.jsx#L303) 1692993 1 webkit-bug-importer 2020-09-29 10:29:13 -0700 <rdar://problem/69753267> 1699224 2 graouts 2020-10-19 05:06:56 -0700 This reproduces in the iOS 14 GM release but not in the most recent iOS 14.2 beta. I will try to figure out when this progressed exactly. 1699226 3 graouts 2020-10-19 05:22:18 -0700 I can only reproduce on iPad too, not on iPhone. 1699234 4 graouts 2020-10-19 06:40:00 -0700 This progressed with r265985, the fix for bug 215655. Marking as dupe. *** This bug has been marked as a duplicate of bug 215655 ***