Task: The Canonical Tag

Indicating a canonical URL is a hint, not a rule: Google may choose a different page The rel=canonical element is only accepted if it appears in the head section Every page of a paginated sequence should be canonicalized to the first page Canonical passes about 100% of link weight, a 301 redirect only 90-99% For PDFs and other non-HTML files the canonical URL can be set with an HTTP Link header