rel="author" attribute value specifies that the linked page contains information about the author of the current document or page. This can be a person or an organization.
rel="author" on an href element.
This link opens a page about the auther of the page.
Read more articles by <a rel="author" href="https://www.hanselman.com/about" target="_blank">Scott Hanselman</a>
The rel attribute defines the relationship between the current page and the linked page.
rel="author" value specifies that the linked page has information about the page or document author.
This setting is useful for articles or blogs which then contain a link about the author.
<tagname rel="author" />
Elements that accept the author value on the rel attribute.
|<a>||Specifies an anchor link -- see example above|
|<area>||Creates clickable areas inside an image map.|
|<link>||Links a resource to the current page|
Here is when rel support started for each browser: