Install wininfo by entering the following commands in the terminal:
sudo apt update sudo apt install wininfo
Description:
dynamic window information viewer
This package provides a window information utility for developers of applications, toolkits, and window managers. wininfo follows your pointer providing information about the windows below. The information presented includes: - a detailed description of the window hierarchy below the pointer; - parsed interpretations of standard properties from both the application window and the window manager; - information about X server resources used by the application.
Homepage: http://www.freedesktop.org/wiki/Software/wininfo
Version: 0.7-6
Section: universe/x11