/usr/share/doc/python3-xlib/html/index.html is in python3-xlib 0.14+20091101-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python3-xlib/html/python-xlib_toc.html
/usr/share/doc/python3-xlib/html/python-xlib_toc.html