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by youngtaff 1599 days ago
> a previous request to that cdn may have cached them in your browser already? Opt-In goes against the architecture of websites

Browsers partition their caches by origin and third-party origin (it's a bit more complex than that in reality) so common third-party resource e.g. fonts, used on one site won't be reused on another

Instead a fresh version of the font will will be fetched

Safari's done this since 2013 (?), and Chromium & Firefox adopting the same behaviour in 2020 (?)