/usr/share/javascript/dojox/mdnd/ is in libjs-dojo-dojox 1.6.1+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/javascript/dojox/mdnd/AreaManager.js
/usr/share/javascript/dojox/mdnd/AutoScroll.js
/usr/share/javascript/dojox/mdnd/DropIndicator.js
/usr/share/javascript/dojox/mdnd/LazyManager.js
/usr/share/javascript/dojox/mdnd/Moveable.js
/usr/share/javascript/dojox/mdnd/PureSource.js
/usr/share/javascript/dojox/mdnd/README
/usr/share/javascript/dojox/mdnd/adapter/
/usr/share/javascript/dojox/mdnd/adapter/DndFromDojo.js
/usr/share/javascript/dojox/mdnd/adapter/DndToDojo.js
/usr/share/javascript/dojox/mdnd/dropMode/
/usr/share/javascript/dojox/mdnd/dropMode/DefaultDropMode.js
/usr/share/javascript/dojox/mdnd/dropMode/OverDropMode.js
/usr/share/javascript/dojox/mdnd/dropMode/VerticalDropMode.js
/usr/share/javascript/dojox/mdnd/resources/
/usr/share/javascript/dojox/mdnd/resources/dnd.css