Display window and font properties in an X server.
Display the name of the root window
xprop -root WM_NAME
Display the window manager hints for a window
xprop -name "window_name" WM_HINTS
Display the point size of a font
xprop -font "font_name" POINT_SIZE
Display all the properties of the window with the ID 0x200007
xprop -id 0x200007