Hreflang is Not Required For Untranslated Pages

November 29, 2019 Source

As hreflang is handled on a per page basis, if you have different language versions of your site but not every page is translated, it isn’t a requirement to have hreflang set up for these pages. John recommends choosing the method that best suits individual websites, this could be either including the URL in the hreflang set or not including the URL.

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Hreflang Internationalization