Advanced canonical tag analysis: multiple canonicals, relative URLs, cross-domain canonicals, and mismatch detection.
This advanced check goes deeper than just looking for a canonical tag. It detects situations where a page has multiple conflicting canonical tags, uses relative URLs instead of absolute ones (which can cause confusion), points to a completely different domain (a cross-domain canonical), or where the canonical URL doesn't match the actual page URL you're visiting.
Canonical tags are your primary tool for telling search engines 'this is the real version of this page.' When you have the same or very similar content accessible at multiple URLs (which is more common than you might think), a correct canonical tag ensures all the SEO value is consolidated to one URL instead of being split and diluted across copies.
Incorrect canonical tags can split your ranking power across multiple URLs, cause the wrong version of a page to appear in search results, or even accidentally tell search engines to ignore important pages entirely. This is one of the most common technical SEO issues on the web.
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