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CSS Custom Properties: What Can and Cannot Go In?
The spec is intentionally very lax in what can and cannot go into CSS custom properties. The future maybe we'll be able to do a lot more, Adam says. But right now you can't concatenate strings or coerce a value that is a pixel because it's not a string. So I wish there was like a something in the browser where you could see all of your variables that are scoped to a certain thing.