CSS nesting is a relatively new CSS feature/ability.
Support for CSS nesting is coming in v24.01, which is currently expected to be available by the end of February 2024, but this is not guaranteed. As usual, any user with a 2024/v24 license will get v24.01 and all other v24.0x updates for free.
Chrome for Developers: CSS Nesting
https://developer.chrome.com/docs/css-ui/css-nesting
MDN Web Docs: CSS nesting
https://developer.mozilla.org/en-US/doc ... SS_nesting
W3C CSS Nesting Module (specification):
https://www.w3.org/TR/css-nesting-1/
Usage of browsers that support CSS nesting is still below 90% as of late January, 2024 per caniuse.com:
https://caniuse.com/css-nesting
Therefore we do not recommend that production sites use this new CSS feature at this time.
CSS nesting support in v24.01+
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CSS nesting support in v24.01+
Albert Wiersch, CSS HTML Validator Developer • Download CSS HTML Validator FREE Trial