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Rule · Canonicalization

Canonical inventory

SEO-CANON-03C4 Informational· w0informational

Class
C4 Informational
Weight
0
Severity on fail
info
Applies to
Any engine

Test this rule on a live site with the canonical tag checker. Free, no account needed.

Scope and evidence

Evaluated on page (P). The book marks this requirement SUPPORTED, OPTIONAL.

Observations

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.

  • self_referencing

    {url} names itself as canonical.

  • cross_page

    {url} names {target} as canonical.

  • absent

    {url} has no canonical. Google says of canonicalization methods that "none of them are required."

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.