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If you have any doubts I  I agree with what Martijn has said. Also, you can validate that there in the header using this https://validator.w3.org/ For more up to date references (if needed) https://moz.com/learn/seo/hreflang-tag https://ahrefs.com/blog/hreflang-tags/ tools https://www.aleydasolis.com/english/international-seo-tools/hreflang-tags-generator/ Hope this is been of some help, Tom