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20:18 The premise to this problem seems wrong, because the selector you have there can never work. It selects the `:root` within “the `:root` that has the checked input” → drop the inner `:root` (or change it to select the correct element, e.g. `my-element`) and things will start working.

It’ll work because of the context step of the cascade that was created for this. It is evaluated before layers and specificity. The context step says that for normal rules the declarations from an outer context (= external stylesheet) win from the inner context (= styles in your component).