Also available in Español The Problem A design token system starts clean. Colors, spacing, type scale all values, all legitimate. Then someone needs a quick way to track whether a modal is open, and a custom property is right there, syntactically identical to every token around it.

Source: [Dev.to](https://dev.to/ortizfranklindev/the-best-css-architecture-starts-by-deciding-what-css-should-never-do-1d5o)

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