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 ...

Does it matter if you put the rel attribute in your HTML link before the link or after it? The answer is no. You can put the attribute in your HTML link where you want. Google will pick it up either ...

Google updated their rel canonical documentation in order to clarify how Google handles the extraction of rel canonical annotations. The clarification is not meant to ...

Google is evolving the nofollow link attribute and introducing additional attributes to help Google understand the nature of links. The two new link attributes ...