Canonical Element

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A canonical element or rel=canonical refers to an HTML element webmasters use to prevent duplicate content issues. The code RFC 6596 is added to the HTML head of a webpage. The code is used to alert Google crawlers of duplicate page content. The canonical (preferred) version of a web page is the page’s original content and is specified as part of search engine optimization credit to the webmaster. Duplicated content should point to the canonical to the source URL, providing SEO credit to the source or website/page.

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