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Still sad about the demise of JNG all these years later. There was even a "light" version of the spec to address the complexity issues, and someone in bug #18574 had even made a reference library which took up less space than the default Mozilla libpng, and maintained their own browser branch. It was maintained for a few years but abandoned when it was clear Mozilla was all in on APNG.

But, yeah, we had all those things in something that was actually in major browsers, 22 years ago.

https://bugzilla.mozilla.org/show_bug.cgi?id=18574

http://mngzilla.sourceforge.net/

There is this JPEG XL art gallery with very nice images 20-100 bytes e.g.: https://jpegxl.info/art/2021-04_jon.html

To see them, enable flag in chrome: chrome://flags/#enable-jxl

I thought that it had existed for decades, but I had confused it for jp2. https://en.wikipedia.org/wiki/JPEG_2000