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What kind of kids would be tech literate enough to use webp while at the same time not literate enough to know how to convert them to jpeg/png? Last time I checked webp isn't really widespread among laymen audience.

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It wasn't webp it was HEIF which is the default image format of iPads/iPhones and the image format is almost completely invisible to the user on iOS.

I guess the developer for that standardized test website didn’t see that one coming... a bunch of teenagers submitting their work using iPhones

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