[Webkit-unassigned] [Bug 257861] New: iOS 17 does not respect fill: 'both' with animation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257861

            Bug ID: 257861
           Summary: iOS 17 does not respect fill: 'both' with animation
           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 466639

  --> https://bugs.webkit.org/attachment.cgi?id=466639&action=review

Code reproduction

Using fill: 'both' causes elements to disappear after their animation ends when using iOS 17 beta 1.

Steps to reproduce:

1. Open code reproduction on an iOS 17 device.
2. Tap "Open Overlay". Observe that the overlay opens.
3. Tap "Close Overlay". Observe that the overlay closes.
4. Tap "Open Overlay" again. Observe that the overlay opens and then disappears.

Expected Behavior:

I expect the overlay to remain visible every time I present it.

Actual Behavior:

The overlay disappears after subsequent presentations.

Other Information:

- This does not reproduce on Chrome 113 or Firefox 113.
- This does not reproduce on iOS 16. This appears to be a regression on iOS 17.

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