/usr/share/doc/python-ipywidgets-doc/html/_static/built/fontawesome-webfont.eot is in python-ipywidgets-doc 5.2.2-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-ipywidgets-doc/html/_static/built/../../../../../fonts/eot/font-awesome/fontawesome-webfont.eot