Assuming you meant "de"coding: it does, albeit I like JPEG XL's more. To me, that point seems an argument for things being the other way around anyways (i.e. general-purpose but not a good delivery format).
I am not sure how exactly the "progressive avif" works, but it looks like basically something optional that comes at a cost in the final file size, whereas in jxl some basic progressive encoding is always available (at least for lossy images) and doesn't come at a cost in file size.
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Assuming you meant "de"coding: it does, albeit I like JPEG XL's more. To me, that point seems an argument for things being the other way around anyways (i.e. general-purpose but not a good delivery format).
Is there something wrong with the other phrasing? You need to have a progressively encoded image before you can decode it progressively.
I stand (partially) corrected: https://github.com/AOMediaCodec/libavif/pull/640
I am not sure how exactly the "progressive avif" works, but it looks like basically something optional that comes at a cost in the final file size, whereas in jxl some basic progressive encoding is always available (at least for lossy images) and doesn't come at a cost in file size.