/usr/share/doc/mapproxy/html/_static/js/jquery-fix.js is in mapproxy-doc 1.9.0-3+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | // No Conflict in later (our) version of jQuery
window.$jqTheme = jQuery.noConflict(true);
|