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Re:Apple Safari 17 beta release notes: JPEG XL support added by illiac786 on Wednesday June 07, 2023 @03:03PM (#36231809)
JXL can losslessly recompress the billions of JPEG images out there, which AVIF cannot.

Also, from your link:

"JPEG XL has better lossless compression compared to WebP, which has better lossless compression compared to AVIF for these images."

I would then argue that the superiority of AVIF over JXL is a point of view at best.

Re:Apple Safari 17 beta release notes: JPEG XL support added by ksec on Wednesday June 07, 2023 @07:50PM (#36235296)
Precisely.