What Hreflang Communicates
Hreflang annotations help search engines understand that multiple URLs are alternate versions intended for different languages or regions. They are useful when equivalent content is available for distinct audiences.
Use Valid Language and Region Codes
Review whether the detected annotations use the appropriate language code and, when needed, a supported language-region combination. Do not use country codes alone as though they were languages.
Alternate Pages Should Reference Each Other
Hreflang implementations work best when equivalent pages provide reciprocal annotations. If page A declares page B as an alternate, page B should normally include the corresponding reference back to page A.
When x-default Is Useful
x-default can identify a fallback or selector page for users who do not match another declared language or region. Add it only when that URL genuinely serves that purpose.
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