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In page Meta element:
"The
languageattribute tells search engines what natural language the website is written in (e.g. English, Spanish or French), as opposed to the coding language (e.g. HTML). It is normally an IETF language tag for the language name. It is of most use when a website is written in multiple languages and can be included on each page to tell search engines in which language a particular page is written. User-agents can (and do) use language information to select language-appropriate fonts, which improves the overall user experience of the page.[citation needed]