Great to know you are planning on implementing it.
Thank you.
It is a bit early to impose it for our users, but I think it is a great thing for the near future, for our photographers community.
It really does it better than jpeg for the same image size (as long as I could test).
Right now it is supported out of the box in chrome (from version 85 or so) and in firefox it is implemented but you have to activate it. Opera and others seem to implement it too.
Edge is based on chromium, and I have been tested (I use mainly edge).
At first it did not work, but I have downloaded the AV1 codec for windows 10 and updated edge to last version (92+) and it seems it works.
“avif” | Can I use… Support tables for HTML5, CSS3, etc
In some testing site there says my browser does not support it, but I have been comparing in other places the avif and jpeg images and I can see the difference, and comparing to firefox (you have to enable avif in about:config) and it seems to get same results.
So I am not sure but seems edge does support it if windows does (with the codec).
I expect windows to implement that codec by default in the near future, in some upgrade.
Some android phones seem not to support it, others need to activate heif images.
Meanwhile it good be good to provide a jpeg when the avif is not supported by the user browser (if possible).