Google's John Mueller confirmed that they completely ignore the HTML lang attribute for determining the language and region of the page. John said this at the 55:54 mark into the video hangout from ...
Google has made a minor update to the meta tags and attributes that Google supports help documentation and added the two tags Google does not support. Those include the meta keywords tag and HTML tag ...
Often, the best practices of SEO don’t give us a direct ranking signal boost from Google, although they help drive significant traffic to our website. Herflang tags are a perfect example of this.
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