Proposal: Custom CSS Functions & Mixins · Issue #9350 · w3c/csswg-drafts

Background Read the full explainer There's an existing issue for Declarative custom functions, which forms the basis for much of this proposal. I'm opening a separate issue here, in order to make a broader proposal building on that, which includes both functions and mixins. From a language perspective, mixins and functions are somewhat distinct – they live at different levels of the syntax, and co