Electron apps don't work in fullscreen over X11
Fullscreen Electron apps under X11 aren't displayed by phoc at all and no pointer events reach them. They behave correctly under sway.
To reproduce:
Run electron -i
and type:
new electron.BrowserWindow({fullscreen: true, backgroundColor: 'red'})
There should be a solid red fullscreen window displayed. Instead, there's only a black background with default cursor on top.