FAQ

How can I get HTTPS/TLS support for my subdomain?

Add a '//CF' in the line of your requested subdomain, see here.

Why did my subdomain.github.io disappear?

This is what happens when you add a CNAME file to a user/organisation GitHub page. It redirects to subdomain.js.org which doesn't exist yet. This is only temporary behaviour till the js.org subdomain is activated.