I find it misleading to call AVIF's "up to four passes" "very flexible".

It seems quite limited compared to the JPEG XL ability to truncate the bitstream anywhere, or send the progressive updates for salient regions first [1].

[1]: https://opensource.googleblog.com/2021/09/using-saliency-in-...

I don't think the truncation thing is beneficial to the web. By the time the browser would terminate the connection, it has likely downloaded way more than it needs https://jakearchibald.com/2025/present-and-future-of-progres...