Safari now blocks all 3rd-party cookies by default.
Ugh so in addition, all local storage (including Indexed DB, etc.) will be deleted after 7 days. More about this by @aral: https://ar.al/2020/03/25/apple-just-killed-offline-web-apps-while-purporting-to-protect-your-privacy-why-thats-a-bad-thing-and-why-you-should-care/
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