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Implementing rel-canonical tags in t4

content type tid 375 showing a section selected for rel canonical tag

What is it

canonical tag (aka "rel canonical") is a way of telling search engines that a specific URL represents the master copy of a page. Using the canonical tag prevents problems caused by identical or "duplicate" content appearing on multiple URLs. [source -]

t4 implementation

Per page

Add content type tid 375 [bootstrap - insert code - head] to the section.

Per site 

Add content type tid 375 [bootstrap - insert code - head] to the site config section of a particular site. This will apply the same rel-canonical tag across all pages in the site.