Currently all regular custom properties gets stored as CSSVariableReferenceValues even when they don't contains any references. They should use the plain CSSVariableData instead.
<rdar://problem/114983076>
Pull request: https://github.com/WebKit/WebKit/pull/17440
Committed 267643@main (7baf601ffa8b): <https://commits.webkit.org/267643@main> Reviewed commits have been landed. Closing PR #17440 and removing active labels.