@divVerent @mjdxp @newt @nytpu @wolf480pl i suspect there are ways to get custom titlebar elements and that there would be an element of nontriviality to them.

in a general sense this is not the compositor's problem. all a compositor is supposed to do is stack image sandwiches on top of one another. so window decorations are mostly a case of asking for a texture sheet, writing to it, and doling out rectangles from the sheet "somewhere."