> RESOLVED: make all property descriptors in @property optional
https://github.com/w3c/csswg-drafts/issues/13211#issuecomment-4040028009

[css-properties-values-api] `@property` descriptors should be optional whenever possible · Issue #13211 · w3c/csswg-drafts
@property rules require a syntax and inherits descriptor; if either are missing, the entire rule is invalid and must be ignored. This requirement seems very unlike any other declaration list in CSS...

