Websites loading from microsoft.github.io

Questions

Which websites load from microsoft.github.io?

The 198 sites listed on this page. A site is listed when its stored HTML has a script, iframe or stylesheet from the host, or one of its own scripts names the host in an absolute URL.

Is microsoft.github.io a third party for every site listed?

Yes: a host under a site's own registrable domain is never recorded for that site, so every site here loads from microsoft.github.io as a dependency outside its own domain.