When you have non-HTML pages on your website, for example PDFs or spreadsheets, you received’t have the ability to apply hreflang during the from the HTML because it doesn’t exist.  Actually, utilizing a herflang tag can be a frightening process for SEOs, Which explains why approximately 31% of Worldwide web-sites https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html