There's a big gap today with how builders like Webflow don't really want you to write code, where imo, they (at least Webflow) could've worked w the idea of being a VDE over a low-code builder. Maybe wasn't as viable pre-LLM, but today an inline editor like Cursor within a visual builder, vv viable.
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There is a css mixins proposal which is the same as tokens in webstudio.
https://css.oddbird.net/sasslike/mixins-functions/