Ok, new sokol header "sokol_framebuffer.h" is out, along with two new samples:

https://floooh.github.io/sokol-html5/framebuffer-sapp.html

https://floooh.github.io/sokol-html5/ilbm-sapp.html

...more infos in the changelog:

https://github.com/floooh/sokol/blob/master/CHANGELOG.md#11-may-2026

Enjoy!