@delta actually @matrix itself doesn't have widgets. Widgets only exists in @element. The specification work is abandoned (https://github.com/matrix-org/matrix-spec-proposals/issues/3803#issuecomment-1472194956) and send people to a chatroom. I asked there and got no answers. So I think, there may be room for #webxdc in matrix as it's an already existing standard with existing impl. Other clients could start on this standard without waiting for "widgets". IMO, widgets and webxdc are different and both are legit.