- Class
- C2 Recommended
- Weight
- 4
- Severity on fail
- major
- Applies to
Scope and evidence
Evaluated on home page of each in-scope origin. The book marks this requirement ELIGIBILITY REQUIREMENT (Deliverable 5); corrected to a recommendation (§1.4).
Fail and opportunity conditions
Each condition has a stable code and a reason template. The evaluator fills the placeholders from observed values only; no sentence in a report is generated. An opportunity condition fires when the documented practice is absent and nothing is broken by its absence; it counts in the score like a fail and is reported as something to add.
missingopportunityThe home page of {origin} has no WebSite structured data. Google generates site names automatically, but says WebSite structured data is the most important source if you want to specify a preference.
url_not_canonical_homeThe WebSite url on {origin} is {value}; Google asks that it be the canonical home page, {expected}.
multiple_blocksThe home page of {origin} has {n} WebSite items. Google asks that site name properties sit in the same node and advises against an additional WebSite block where it can be avoided.
The documented fix
Add one WebSite item with name (and optionally alternateName) and url set to the canonical home URL; keep the name consistent with the title and og:site_name.
Sources, quoted
These are the passages the rule rests on, stored once in the knowledge base and emitted exactly as written. A citation marked for specific conditions appears only on findings with those codes.
“To indicate your site name preference, add WebSite structured data to your home page.”
[G-SITENAME] Provide a site name to Google Search · How site names in Google Search are created · last updated 2025-12-10
https://developers.google.com/search/docs/appearance/site-names“However, WebSite structured data is most important, if you want to specify a preference.”
[G-SITENAME] Provide a site name to Google Search · How site names in Google Search are created · last updated 2025-12-10
https://developers.google.com/search/docs/appearance/site-names“Set this to the canonical home page of your site's domain or subdomain.”
[G-SITENAME] Provide a site name to Google Search · Required properties (url) · last updated 2025-12-10
https://developers.google.com/search/docs/appearance/site-names“avoid creating an additional WebSite structured data block on your home page if you can help it.”
[G-SITENAME] Provide a site name to Google Search · Technical guidelines · last updated 2025-12-10
https://developers.google.com/search/docs/appearance/site-names