They said that it could save up to 50% of the file size without losing quality over JPEG.
I’m looking for alternative file formats and unfortunately, Basis has lots of issues yet.
The answer to this question (or any other media type) can be found here:
https://caniuse.com/#feat=jpegxr
If the file type is not supported by major browsers, it will have to bring something to the table in order to be worthwhile to write a decoder for it.
I am honestly not familier with Jpeg XR, but there are so may diferent types of non-standardaized files, and we cannot support them all. DDS for example is supported, because of the nice way it plays with GPUs.
Thank you!