Re: [w3ctag/design-reviews] JPEG XL decoding (#633)

Regarding the MIME Sniffing standard: I suspect that besides AVIF, there might be two more image formats missing from the list, where I suspect (though haven't checked) that the relevant browsers in practice do magic sniffing:

- JPEG 2000, supported in all versions of Safari
- JPEG XR (aka WDP, HD Photo, and Windows Media Photo), supported in Internet Explorer and in old versions of Edge

I am not sure what the goal of the MIME Sniffing standard is: is it to document exhaustively what kind of bitstreams might be mistaken for images (in some browsers, not necessarily all browsers), or is it supposed to document only the bitstreams that will be mistaken for images in all browsers? (from a security perspective, I suppose the first one makes more sense).

Maybe this discussion is better moved to the MIME Sniffing standard. I just opened an issue there: https://github.com/whatwg/mimesniff/issues/143

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