Xad.js.org

[Ronin546]

What is xad.js.org used for?
What is xad.js.org/xad_no used for?
Why does it say "noack" when you visit xad.js.org ?
Why does it say "ack" when you visit xad.js.org/xad_no ?
Links:
https://xad.js.org
https://xad.js.org/xad_no

[MattIPv4]

You've asked about this before, and were given an answer; it is a test site: https://github.com/orgs/js-org/discussions/12111#discussioncomment-17832683