In short, the noreferrer link type hides referrer information when the link is clicked. A link with the noreferrer link type looks something like this: <a href=”http://www.example.com” rel=”noreferrer”>Click here for more info</a> If someone arrives at your site from a link that uses this link type, your analytics won’t show who refered that link. Instead, … Read more
You may use external for every link to a different website, no matter if it’s yours or not, if it’s on the same host or not. You may use nofollow for every link that you don’t endorse (for example: search engines shouldn’t assume that it’s a relevant link and should not give any ranking credit … Read more
That is a great question. If you look at the example for Hal you will see that the rels are defined within the context of the sub-resource. I do not know of any definitive guide on when the rel is related to the resource as a whole or a contained sub resource. The only extra … Read more
In HTML 4.01, there is the profile attribute for the head element: This attribute specifies the location of one or more meta data profiles, separated by white space. For future extensions, user agents should consider the value to be a list even though this specification only considers the first URI to be significant. It is … Read more