In a future patch I need to make a GraphicsLayerCA that just creates a single CATransformLayer in the CALayer tree; currently, setting preserves3D() does create a CATransformLayer, but also creates a child CALayer for any rendered content.
Pull request: https://github.com/WebKit/WebKit/pull/3478
Committed 253606@main (6ca6aad73c5b): <https://commits.webkit.org/253606@main> Reviewed commits have been landed. Closing PR #3478 and removing active labels.
<rdar://problem/98901413>