/usr/share/javascript/spin.js/spin.jquery.js is in libjs-spin.js 1.2.8+dfsg2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17  | // jQuery add-on for allowing spin.js to act on jQuery elements directly.
$.fn.spin = function(opts) {
  this.each(function() {
    var $this = $(this),
        data = $this.data();
    if (data.spinner) {
      data.spinner.stop();
      delete data.spinner;
    }
    if (opts !== false) {
      data.spinner = new Spinner($.extend({color: $this.css('color')}, opts)).spin(this);
    }
  });
  return this;
};
 |