npm

xwininfo

Print information about windows on an X server

brewmacoslinux
Try with needOr install directly
Source

About

Print information about windows on an X server

Commands

xwininfo

Examples

Interactively select a window and display its information$ xwininfo
Get information about a specific window by ID$ xwininfo -id 0x4a00001
Display window tree and properties for the root window$ xwininfo -root -tree