Despite the fact that Gary Illyes, a Google analyst, thinks that search engines like google may possibly rely considerably less on hreflang and much more on automatic language detection in the future, for now, the tag is our best guess.  Rel=canonical must only show up during the of the doc. https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-google-rich-snippets-json-ld-opengraph-twitter-tags-schemaorg.html