When reading the wiki, I got the impression that it was already possible to run LibreOffice on a server/browser (although not out of the box). So I went and downloaded libreoffice-18.104.22.168, compiled it with
./configure --without-java --enable-gtk3 --enable-static-gtk --prefix=$HOME/test/soffice --without-doxygen --with-system-cairo
and tried to run it with
SAL_USE_VCLPLUGIN=gtk3 GDK_BACKEND=broadway test/soffice/lib/libreoffice/program/soffice -calc
Unfortunately it just started regularly, no open ports.
So what is the status of this feature? The wiki page was not touched over a year. To me it seems like a shame not to push such a feature.