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

Okay, now I see the intention - luckily we have guidelines for this exact case.

https://w3ctag.github.io/design-principles/#new-data-formats

The part that probably is of your interest is this:

> For legacy reasons browsers support MIME type sniffing, but we do not recommend extending the pattern matching algorithm, due to security implications, and instead recommend enforcing strict MIME types for newer formats.

So no, please do not extend mimesniff for newer formats. We understand this may cause some inconveniences, but we are trying to move away from magic.

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