[Webkit-unassigned] [Bug 263996] New: ios 17.0 regression, animation flicker with multiple accelerated animations and direction change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=263996

            Bug ID: 263996
           Summary: ios 17.0 regression, animation flicker with multiple
                    accelerated animations and direction change
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ldebeasi at gmail.com
                CC: dino at apple.com, graouts at apple.com

Created attachment 468433

  --> https://bugs.webkit.org/attachment.cgi?id=468433&action=review

Code reproduction

Starting in iOS 17.0 having multiple accelerated animations on the same element causes a flicker when changing the direction.

Steps to reproduce:

1. Open attached reproduction on a device running iOS 17.0+.
2. Tap "Run Animation". Observe that the square translates from the bottom of the screen to the top.
3. Drag the red square. The square should move with your pointer.
4. Release your pointer. Observe that the square jumps to the top of the screen before returning to its previous position and translating to the top of the screen.

Expected Behavior:

I expect the square to remain in its last position before translating to the top of the screen when I remove my pointer.

Actual Behavior:

The square jumps to the top of the screen, then returns to its last position before translating to the top of the screen when I remove my pointer.

Other Info:
- I am able to reproduce this starting on iOS 17.0
- I can reproduce this on Safari 17 on macOS

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