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Re:Show HN: JPEG.rocks – Privacy-aware JPEG optimizer built ... by neslinesli93 on Sunday January 10, 2021 @10:29AM (#25715556)
I don't know, sorry.

I mean, you can be completely sure that the website works offline by unplugging the cable/turning off your wifi connection after it's completely loaded. But that's just a functional test, not something you can expect users to do during a normal browsing session

Re:Show HN: JPEG.rocks – Privacy-aware JPEG optimizer built ... by purplecats on Thursday January 14, 2021 @05:20PM (#25783553)
thats not enough, it can send it in the next connection. unless you want to load a site once, and never connect your computer to the internet ever again.