Are country and language statements case sensitive?

Are country and language statements case sensitive? For example, Eg: hreflang=”en-gb” vs hreflang=”en-GB or hreflang=”EN-GB”

No they are not case sensitive and search engines will accept both. However, the standard syntax does typically show the country/region in upper case for example for the UK it can be hreflang=”en-GB” where the language is in lower case and the country/region in upper case both both versions are accepted.


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