Canonical links are used to specify the preferred version of this web page. It is used to prevent duplicate content for search engines. They must be used within the `` tags of your HTML5 document. ``` ``` # How do I fix this ? Ensure that when you use canonical links they are inside the `` tags. Otherwise they are rendered useless and search engines might not bestow enough love upon you. # Resources * [Wikipedia](https://en.wikipedia.org/wiki/Canonical_link_element) * [Matt Cutts](https://www.mattcutts.com/blog/canonical-link-tag/)