[Webkit-unassigned] [Bug 250387] New: Using `rotate: x` and `transform: rotate(x)` yields different behavior with SVG

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250387

            Bug ID: 250387
           Summary: Using `rotate: x` and `transform: rotate(x)` yields
                    different behavior with SVG
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cory at abeautifulsite.net

This was reported to me in Shoelace (https://github.com/shoelace-style/shoelace/issues/1121) after switching `transform: rotate(x)` to `rotate: x`. The spinner component suddenly started animating strangely, despite the values supposedly being equivalent. I've only been able to reproduce this in Safari.

I reduced the problem down to what seems like an issue with SVG elements, possibly limited to animating `stroke-dasharray`. The following CodePen example draws two SVGs. Both are identical, but the one on the left uses `rotate: x` and the one on the right uses `transform: rotate(x)`. The one on the left animates back and forth, whereas the one on the right animates the full circle.

https://codepen.io/claviska/pen/dyjvebY?editors=1100

I haven't been able to find other reports of this in the bug tracker. It happens in Safari 16 and TP (Release 160).

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