Very nice! I hadn’t heard of that. I’m amused at how exactly it matches my mullings of how I’d do it in a web tech stack (manifest field, env() variables, navigator property with events, CSS property to indicate draggable area), with only a couple of missing pieces: the ability to match the appearance of the native controls and native conventions (e.g. `background: env(titlebar-area-background); color: env(titlebar-area-color); text-align: env(titlebar-area-align)`, though for best results you’d still need a little more here and there).

I’ve thought of trying to design something like this for Wayland server-side decorations or at least making a better replacement for libdecor, but it wouldn’t help me personally and it’s clear that GNOME isn’t having a bar of the entire approach, so I sadly just don’t think it’s worth the effort.