CHECK GLOSSARY · HREFLANG-001

Invalid hreflang codes

In plain words: Malformed hreflang values are ignored, so the wrong language version can rank.

How to fix it

Use ISO codes: language lowercase, region UPPERCASE.

Official sources

• Google: Localized versions

Related checks

• MOBILE-001: Missing viewport tag
• H2-001: Skipped heading levels
• IMG-002: Images missing dimensions
• MIXED-001: Mixed content

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