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HEIF works in Safari, and I believe Android will have it soon if it doesn't already. As for AV1, browsers can add it anytime they want…

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Looking at CanIUse [1][2], it seems like the HEIF support is in macOS itself, and not the Safari browser. I wouldn't be surprised if the Windows version of Safari didn't support it.

[1] https://caniuse.com/#feat=heif

[2] https://github.com/Fyrd/caniuse/issues/3767

Safari for Windows has been discontinued a few years back.

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