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canonical-tag

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Audit and fix duplicate-page canonicalization across protocol, host, slash, default-document, extension, case, and tracking-parameter URL variants. Use for canonical URLs, duplicate content, preferred URLs, URL consolidation, or conflicting canonical signals. For URL naming and hierarchy design, use url-structure.

skills/seo/technical/canonical/SKILL.md

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# SEO Technical: Canonicalization

Determine the preferred URL for each page identity, consolidate duplicate variants, and verify that redirects, canonical annotations, internal links, sitemaps, and localization signals agree.

## Scope

Treat these as one duplicate-page canonicalization problem when they expose the same or substantially similar primary content:

- HTTP and HTTPS;
- www and non-www hosts, including combined protocol/host variants;
- trailing-slash and non-trailing-slash paths;
- repeated path slashes such as `/docs//guide`;
- directory defaults such as `/docs/` and `/docs/index.html`;
- historical extensions such as `/guide.html` and `/guide`;
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