What this test does

The real link is in <head>. A second indieauth-metadata link, pointing at a decoy server, is in the page body — where comments, bios and other people's content end up on many sites.

How it passes

Your client uses the link from <head> and never touches the decoy. Reading links from the body lets anyone who can put HTML on a page choose its server.

Specification
§4.1