Hi.
I though I had a previous post when I posted some web applications that I found running under OS/2's browser but I was not able to found those.
I found that there is some "web based" LibreOffice right here:
https://www.rollapp.com/app/lowriterIt is not that LibreOffice was ported to the web, it is more like a virtual Linux desktop on the browser that runs the application.
It run slow to me, but runs on Firefox. Give it a try and let me know.
Regards