I wouldn't be too surprised if every big CDN already does something like that internally as a competitive advantage, and if so then the incentives switch around and there's no benefit publically switching to JPEG XL - when everyone has it, there's no easy way to do better than everyone else.
A great blog post on this by one of the creators of the format, Jon Sneyers:
https://cloudinary.com/blog/time_for_next_gen_codecs_to_deth...
For Firefox you need the nightlies I believe - I had no luck with release Firefox 93.
In Yinglish (Yiddish-English) jizzle would mean something like 'a drop of seamen'.
At least, JPEG-XL offers a solution on this side, like store as JPEG-XL and serve as old JPEG to IE11 users. Now, if only there was a JPEG-XL implementation for Java...
Edit: I found few examples here: https://colinbendell.github.io/webperf/animated-gif-decode/a...
https://en.wikipedia.org/wiki/AV1#AV1_Image_File_Format_(AVI...
When people were comparing it to GIF I specifically tried to check if it supported animations, but came up with little.
> AV1 Image File Format (AVIF) is an image file format specification for storing images or image sequences compressed with AV1 in the HEIF file format.
If you mean the image format, probably never. It's based on the HEVC/H.265 licensing minefield. For that reason, I don't expect it to ever be supported on Chromium or Firefox based browsers.
Having fewer browsers support .heic format would be a benefit -- as it would decrease the chances of the format surviving.
PARTY!
I've been waiting for this for a long time. The last big hurdle for this was that color spaces weren't applied correctly.
If you haven't taken a look at AVIF, do. You can get a similar looking image in AVIF at half the size as a JPEG. I find AVIF's image artifacts preferable to JPEG's.