@bigandy Yeah, this is not yet possible with the `<syntax>`. And it is something I wanted for a while, and wanted to create an issue about — did just now: https://github.com/w3c/csswg-drafts/issues/14065 — upvotes/comments with more concrete use cases are welcome :)
Right now, the (https://drafts.csswg.org/css-values-5/#typedef-syntax) is pretty limited: […] which resembles a limited form of the CSS value definition syntax used in specifications to de...
