js-dos 8.5.3 -- https://js-dos.com, by Alexander Guryanov (caiiiycuk)
License: GNU General Public License v2.0 (GPL-2.0), as stated in package.json here.

These files are the unmodified distribution files of the npm package js-dos@8.5.3
(dist/js-dos.js, dist/js-dos.css and dist/emulators/*), served so the Reko3 page does not depend on
v8.js-dos.com. Their complete corresponding source code is in that same package and in the project's
repository:
  https://registry.npmjs.org/js-dos/-/js-dos-8.5.3.tgz
  https://github.com/caiiiycuk/js-dos