Oh wow, so that's basically a way of getting around the fact that JavaScript doesn't have built-in zip/gz/deflate support, but browsers do have built-in PNG support? Clever.
Unfortunately it still doesn't expose Brotli [1], which should be already in web browsers due to `Content-Encoding: br`. There is a very roundabout way to decompress a Brotli stream though, and that's how I've got a typing game into 1 KB of JavaScript [2] back in 2022.
https://developer.mozilla.org/en-US/docs/Web/API/Compression...