The next-export-lang package can be installed in a Node project so it can be integrated as part of your build process. Run npm install -D next-export-lang; Add next-export-lang to your build command ...

The lang attribute specifies the language of the element's content. Common examples are "en" for English, "es" for Spanish, "fr" for French, and so on. This plugin slice the language attribute for ...

Using this method, you can add all of your relevant tags in one file instead of manually adding link attributes to the HTML of every webpage. Once completed, submit an updated sitemap to Google ...

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 ...