Just in case it wasn't clear from all the replies here, using an unknown rel-attribute on links doesn't do anything, and since the default behavior is to use links normally, this just treats links ...

An HTML element is like a basic building block of an HTML webpage. An element can be extended with an attribute. In this case the Link element is modified by the Rel attribute.

Google's John Mueller said that if you can, it is best to use the rel=sponsored link attribute on your affiliate links.

With these attributes, you have greater control over how search engines identify certain links. Here's how to use them properly.

Google is also adding two new link attributes, one for sponsored links and one for user generated content links. Google has announced Tuesday that today the nofollow link attribute (i.e. rel ...