/usr/share/gtk-doc/html/ is in libatk1.0-doc 2.10.0-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/atk/
/usr/share/gtk-doc/html/atk/AtkAction.html
/usr/share/gtk-doc/html/atk/AtkComponent.html
/usr/share/gtk-doc/html/atk/AtkDocument.html
/usr/share/gtk-doc/html/atk/AtkEditableText.html
/usr/share/gtk-doc/html/atk/AtkGObjectAccessible.html
/usr/share/gtk-doc/html/atk/AtkHyperlink.html
/usr/share/gtk-doc/html/atk/AtkHypertext.html
/usr/share/gtk-doc/html/atk/AtkImage.html
/usr/share/gtk-doc/html/atk/AtkNoOpObject.html
/usr/share/gtk-doc/html/atk/AtkNoOpObjectFactory.html
/usr/share/gtk-doc/html/atk/AtkObject.html
/usr/share/gtk-doc/html/atk/AtkObjectFactory.html
/usr/share/gtk-doc/html/atk/AtkRegistry.html
/usr/share/gtk-doc/html/atk/AtkRelation.html
/usr/share/gtk-doc/html/atk/AtkRelationSet.html
/usr/share/gtk-doc/html/atk/AtkSelection.html
/usr/share/gtk-doc/html/atk/AtkStateSet.html
/usr/share/gtk-doc/html/atk/AtkStreamableContent.html
/usr/share/gtk-doc/html/atk/AtkTable.html
/usr/share/gtk-doc/html/atk/AtkText.html
/usr/share/gtk-doc/html/atk/AtkUtil.html
/usr/share/gtk-doc/html/atk/AtkValue.html
/usr/share/gtk-doc/html/atk/AtkWindow.html
/usr/share/gtk-doc/html/atk/api-index-1-12.html
/usr/share/gtk-doc/html/atk/api-index-1-13.html
/usr/share/gtk-doc/html/atk/api-index-1-18.html
/usr/share/gtk-doc/html/atk/api-index-1-20.html
/usr/share/gtk-doc/html/atk/api-index-1-22.html
/usr/share/gtk-doc/html/atk/api-index-1-24.html
/usr/share/gtk-doc/html/atk/api-index-1-26.html
/usr/share/gtk-doc/html/atk/api-index-1-28.html
/usr/share/gtk-doc/html/atk/api-index-1-3.html
/usr/share/gtk-doc/html/atk/api-index-1-30.html
/usr/share/gtk-doc/html/atk/api-index-1-32.html
/usr/share/gtk-doc/html/atk/api-index-1-4.html
/usr/share/gtk-doc/html/atk/api-index-1-6.html
/usr/share/gtk-doc/html/atk/api-index-deprecated.html
/usr/share/gtk-doc/html/atk/api-index-full.html
/usr/share/gtk-doc/html/atk/atk-AtkHyperlinkImpl.html
/usr/share/gtk-doc/html/atk/atk-AtkPlug.html
/usr/share/gtk-doc/html/atk/atk-AtkSocket.html
/usr/share/gtk-doc/html/atk/atk-AtkState.html
/usr/share/gtk-doc/html/atk/atk-Versioning-Utilities.html
/usr/share/gtk-doc/html/atk/atk.devhelp2
/usr/share/gtk-doc/html/atk/atk.html
/usr/share/gtk-doc/html/atk/home.png
/usr/share/gtk-doc/html/atk/index.html
/usr/share/gtk-doc/html/atk/index.sgml
/usr/share/gtk-doc/html/atk/left.png
/usr/share/gtk-doc/html/atk/right.png
/usr/share/gtk-doc/html/atk/style.css
/usr/share/gtk-doc/html/atk/up.png
/usr/share/gtk-doc/html/atk/utilities.html