[Webkit-unassigned] [Bug 239906] New: Rotate animation doesn't interpolate between 0 and 1turn without forced 50%

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239906

            Bug ID: 239906
           Summary: Rotate animation doesn't interpolate between 0 and
                    1turn without forced 50%
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattaningram at gmail.com
                CC: dino at apple.com, graouts at apple.com

In certain situations Safari Technology Preview is not interpolating properly between 0 and 1turn in a keyframe animation.

I noticed my loading spinner wasn't working anymore in Safari Technology Preview so I created a codepen to illustrate the bug:

https://codepen.io/mattaningram/pen/zYROyqL

If you uncomment the second spinner animation keyframe you will see that forcing Safari to interpolate to a 50% position in the 0 to 1 turn make the animation behave the way it does in older Safari versions and other browsers. However this behavior of not automatically interpolating between 0 and 1turn is not reproducible in a simpler example.

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