Standards
hreflang
A signal that tells search engines which language and region version of a page to serve.
Definition
A <link rel="alternate" hreflang="..."> annotation that maps each page variant to its language-region pair (e.g., en-US, fr-CA, x-default). Misconfigured hreflang creates wrong-locale rankings and can trigger duplicate-content treatment across markets. Bidirectional consistency matters: if A links to B, B must link back to A.
See also
More in Standards
JSON-LD
JSON-formatted structured data that Google and AI engines extract for entity understanding.
RFC 9110 (HTTP Semantics)
The current IETF standard defining HTTP semantics: methods, status codes, headers.
RFC 9309 (Robots Exclusion Protocol)
The IETF standard that formally specifies robots.txt parsing and behavior.
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