Nested CSS incorrectly flagged as erroneous

Hello, 

All nested CSS examples on https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Nesting/Using are flagged as erroneous when entered in the Direct Input tab on https://jigsaw.w3.org/css-validator/#validate_by_input. 

It seems clear that the CSS validator must be updated. When will that be done? 

With kind regards, 



Frank Conijn

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