[AndyB] Canonical link 1.0

Allows setting an alternate canonical link to threads.

A canonical link, also known as a canonical tag or canonical URL, is an HTML element that helps webmasters prevent duplicate content issues in search engine optimization (SEO) by specifying the "canonical" or "preferred" version of a web page.

(Example of Canonical link)


(Example of Canonical link overlay)



(Example thread)



(Example of User group permissions)



Features:

• All phrases start with canonicallink_ for your convenience.

User group permissions:

Typically the Administrative has the Meta tags set to Yes.

Database modifications:

This add-on adds one field to the xf_thread table:
andy_canonical_link