/usr/share/doc/python-ipywidgets-doc/html/_static/built/ui-bg_highlight-soft_75_cccccc_1x100.png is in python-ipywidgets-doc 5.2.2-3.
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It is a symlink to /usr/share/doc/python-ipywidgets-doc/html/_static/built/../../../../../javascript/jquery-ui-themes/smoothness/images/ui-bg_highlight-soft_75_cccccc_1x100.png