[Webkit-unassigned] [Bug 217061] New: onTransitionEnd buggy on devices using iOS 14

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217061

            Bug ID: 217061
           Summary: onTransitionEnd buggy on devices using iOS 14
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nicolekinser21 at gmail.com
                CC: dino at apple.com

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)

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