Returns a DOMString representing the preferred language of the user, usually the language of the browser UI.
Returns a DOMString representing the preferred language of the user, usually the language of the browser UI. The null value is returned when this is unknown.
MDN
Returns a Array of DOMStrings representing the the user's preferred languages.
Returns a Array of DOMStrings representing the the user's preferred languages. The language is described using BCP 47 language tags. The null value is returned when this is unknown.
MDN
NavigatorLanguage contains methods and properties related to the language of the navigator.
MDN