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> JPEG2000 first became available in browsers 10+ years ago

Apart from Safari (https://en.wikipedia.org/wiki/JPEG_2000#Application_support), I'm not sure it's supported at all.

Chrome is the only browser to support WebP, as far as I know (I don't really count modern Opera or Chrome on Android as separate browsers). That was why I made the comparison.

And I guess if Safari had supported WebP back when Chrome and Safari were on the same codebase you would haven't counted them as separate browsers either?

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