Why it matters
Google's guidelines recommend the same structured data on all duplicates of a page, not only on the canonical. Said at Search Central Live: deduplication runs before feature extraction, so markup that exists only on a URL that loses canonical selection may never be extracted.
How to meet it
Render markup from the page template rather than per URL, so parameter, print and mobile variants carry identical markup, and make sure the preferred canonical has the complete markup.
How to test it
The Rich Results Test returns the same items for the canonical and for a duplicate variant.
How Regensbot covers it
Decided from one URL.
An audit reads the response, the headers, the HTML, robots.txt, the sitemaps and the structured data, and the finding shows the evidence it saw.
Sources
Google documents01
Claims in the knowledge base03
- D2-C451SourceFinding the gold nuggets: structured data, media, and more!Google's documentation
- D2-C444UndocumentedFinding the gold nuggets: structured data, media, and more!Said on stage
- D2-C450n/aFinding the gold nuggets: structured data, media, and more!The author's interpretation
Claim IDs refer to the Search Central Live 2026 knowledge base. The knowledge base (opens in a new tab)
- Undocumented
- Said or shown at the event, not in the documentation.
- Source
- The claim is the cited document itself.
- n/a
- Nothing to verify: a quotation, framing, opinion or analysis.