Sorry (not sorry)
Hello! If you know of any HTML Web Component[^1]-based design systems, I would love to hear about them! I'm specifically after design systems using web components that wrap and progressively enhance slotted/light DOM HTML. The only one I know of is California's.[^2]
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[^1]: In the sense @adactio used the term (https://adactio.com/journal/20618).
[^2]: See, e.g., CA's alpha accordion component (https://designsystem.webstandards.ca.gov/components/accordion/readme/)