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Rule · Performance and mobile

Mobile and desktop versions are equivalent

SEO-PERF-03C2 Recommended· w4

Class
C2 Recommended
Weight
4
Severity on fail
major
Applies to
Google

Scope and evidence

Evaluated on the home page and one sample intended page. The book marks this requirement DOCUMENTED RECOMMENDATION, SEARCH-ENGINE-SPECIFIC. It needs parity; without that input the rule reports as not evaluated rather than guessing.

Visible-text differences are info only, since layouts can legitimately vary.

Fail 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.

  • title_differs

    The mobile and desktop versions of {url} differ in {field}: {mobile_value} versus {desktop_value}. For most sites Google primarily indexes the mobile version, and it asks that the mobile site contain the same content as the desktop site, including structured data and metadata.

  • robots_differs

    The mobile and desktop versions of {url} differ in {field}: {mobile_value} versus {desktop_value}. For most sites Google primarily indexes the mobile version, and it asks that the mobile site contain the same content as the desktop site, including structured data and metadata.

  • canonical_differs

    The mobile and desktop versions of {url} differ in {field}: {mobile_value} versus {desktop_value}. For most sites Google primarily indexes the mobile version, and it asks that the mobile site contain the same content as the desktop site, including structured data and metadata.

  • structured_data_differs

    The mobile and desktop versions of {url} differ in {field}: {mobile_value} versus {desktop_value}. For most sites Google primarily indexes the mobile version, and it asks that the mobile site contain the same content as the desktop site, including structured data and metadata.

The documented fix

Serve one responsive document per URL, or keep separate templates in parity.

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.