Used to add a placard to a window. A placard is a control that you can use as an information display or as background fill for a control area. Placards have three states: normal, pressed, and disabled.
|| On macOS, Placard is not a native control and does not automatically change its appearance in dark mode.
Perhaps the most familiar use of the Placard control is as a small information panel, often placed at the bottom of a window to the left of the horizontal scroll bar.
RectControl class; Canvas control.