Any ereader that uses a webkit or webengine core that was made in the last two years (2024?) probably could.
Quote:
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Native CSS nesting is widely supported across all modern browsers. As of late 2023, it reached "Baseline 2023" status, meaning it is available in the stable versions of all major engines: Chromium (Chrome, Edge), Gecko (Firefox), and WebKit
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Though I doubt any epubs exist with nested css in the wild (yet). This is just future proofing Sigil as I am sure those who pull in html from websites to create their ebooks will eventually run into it and it can mess with finding classes or and used vs unused selectors, and deleting selectors in Sigil (before this code was added). Now with this de-nester code it should not, with the added bonus of making the css more compatible with older e-readers.