XUASTC was just released ❤️❤️❤️
https://github.com/BinomialLLC/basis_universal
allowing for all ASTC Block sizes to be used on the web, once support lands in the big web 3D libraries like @mrdoob 's Three.js.
To me, this is huge. Relying on pre-calculated lighting when building stuff like https://mymachine.dmgmori.com , I constantly fight for VRAM, as older iPhones have very strict limits. XUASTC brings the all the remaining modern GPU compression schemes to the web in a standardized manner.