CSS nesting rules not working on jupyter

[terlan4]

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Hi, the problem is modern native CSS supports nesting rules in browsers. but it doesn't work on jupyterlab or jupyter notebooks and I dont know why. Because nested css is included in bundled code, still not working tho. What can be the issue and how can I fix it? (I want to use native CSS rather than SASS, so please do not suggest to use SASS instead. I would rather love to solve the issue)

i've tried nesting rules on jupyterlab local dev, jupyterlab online, jupyter notebook online, jupyterlite online. None worked :((

[RRosio]

Thank you for opening this issue @terlan4, as these changes will likely be addressed by changes in JupyterLab, I will close this in favor of jupyterlab/jupyterlab#15350.