/usr/share/gtk-doc/html/ is in epiphany-browser-dev 3.4.0.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/epiphany/
/usr/share/gtk-doc/html/epiphany/EphyDialog.html
/usr/share/gtk-doc/html/epiphany/EphyLocationEntry.html
/usr/share/gtk-doc/html/epiphany/EphyNodeView.html
/usr/share/gtk-doc/html/epiphany/EphySearchEntry.html
/usr/share/gtk-doc/html/epiphany/EphyTreeModelNode.html
/usr/share/gtk-doc/html/epiphany/EphyTreeModelSort.html
/usr/share/gtk-doc/html/epiphany/EphyWebView.html
/usr/share/gtk-doc/html/epiphany/EphyWindow.html
/usr/share/gtk-doc/html/epiphany/EphyZoomAction.html
/usr/share/gtk-doc/html/epiphany/annotation-glossary.html
/usr/share/gtk-doc/html/epiphany/ch01.html
/usr/share/gtk-doc/html/epiphany/ch02.html
/usr/share/gtk-doc/html/epiphany/ch03.html
/usr/share/gtk-doc/html/epiphany/epiphany-EphyLocationAction.html
/usr/share/gtk-doc/html/epiphany/epiphany-EphyToolbar.html
/usr/share/gtk-doc/html/epiphany/epiphany-Epiphany-Debug-Helpers.html
/usr/share/gtk-doc/html/epiphany/epiphany-Epiphany-File-Helpers.html
/usr/share/gtk-doc/html/epiphany/epiphany.devhelp2
/usr/share/gtk-doc/html/epiphany/home.png
/usr/share/gtk-doc/html/epiphany/index.html
/usr/share/gtk-doc/html/epiphany/index.sgml
/usr/share/gtk-doc/html/epiphany/left.png
/usr/share/gtk-doc/html/epiphany/right.png
/usr/share/gtk-doc/html/epiphany/style.css
/usr/share/gtk-doc/html/epiphany/up.png