/usr/share/javascript/prettify/ is in libjs-prettify 2015.12.04+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/javascript/prettify/lang-apollo.js
/usr/share/javascript/prettify/lang-basic.js
/usr/share/javascript/prettify/lang-clj.js
/usr/share/javascript/prettify/lang-css.js
/usr/share/javascript/prettify/lang-dart.js
/usr/share/javascript/prettify/lang-erlang.js
/usr/share/javascript/prettify/lang-go.js
/usr/share/javascript/prettify/lang-hs.js
/usr/share/javascript/prettify/lang-lasso.js
/usr/share/javascript/prettify/lang-lisp.js
/usr/share/javascript/prettify/lang-llvm.js
/usr/share/javascript/prettify/lang-logtalk.js
/usr/share/javascript/prettify/lang-lua.js
/usr/share/javascript/prettify/lang-matlab.js
/usr/share/javascript/prettify/lang-ml.js
/usr/share/javascript/prettify/lang-mumps.js
/usr/share/javascript/prettify/lang-n.js
/usr/share/javascript/prettify/lang-pascal.js
/usr/share/javascript/prettify/lang-proto.js
/usr/share/javascript/prettify/lang-r.js
/usr/share/javascript/prettify/lang-rd.js
/usr/share/javascript/prettify/lang-rust.js
/usr/share/javascript/prettify/lang-scala.js
/usr/share/javascript/prettify/lang-sql.js
/usr/share/javascript/prettify/lang-swift.js
/usr/share/javascript/prettify/lang-tcl.js
/usr/share/javascript/prettify/lang-tex.js
/usr/share/javascript/prettify/lang-vb.js
/usr/share/javascript/prettify/lang-vhdl.js
/usr/share/javascript/prettify/lang-wiki.js
/usr/share/javascript/prettify/lang-xq.js
/usr/share/javascript/prettify/lang-yaml.js
/usr/share/javascript/prettify/prettify.css
/usr/share/javascript/prettify/prettify.js
/usr/share/javascript/prettify/run_prettify.js