Google: Stick With ISO 3166-1 For Hreflang, Not 3166-2

Google responded to a webmaster asking if they can use ISO 3166-2 for their hreflang files saying you should probably stick with ISO 3166-1. Google’s documentation specifically says they support ISO 3166-1 and makes no mention of ISO 3166-2…

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Google: Stick With ISO 3166-1 For Hreflang, Not 3166-2

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