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HTMLElement: lang property - Web APIs | MDN
A string. Common examples include "en" for English, "ja" for Japanese, "es" for Spanish and so on. If unspecified, the value is an empty string.
// this snippet compares the base language and
// redirects to another URL based on language
if (document.documentElement.lang === "en") {
window.location.href = "Some_document.html.en";
} else if (document.documentElement.lang === "ru") {
window.location.href = "Some_document.html.ru";
}