Short answer: you'll get all of new web platform features (Container Queries, Subgrid, etc.); you may not get certain Safari-specific features that require a feature only present in macOS Ventura.
You can get Safari Technology Preview for Monterey and Big Sur that has those new web platform features right now [1].
Short answer: you'll get all of new web platform features (Container Queries, Subgrid, etc.); you may not get certain Safari-specific features that require a feature only present in macOS Ventura.
You can get Safari Technology Preview for Monterey and Big Sur that has those new web platform features right now [1].
[1]: https://developer.apple.com/safari/technology-preview/