On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 37 on 2014-08-26 Note: Before Chrome 65, navigator.languages[0] is not guaranteed to equal navigator.language.
In Chrome Android version 37 on 2014-09-03 Note: Before Chrome Android 65, navigator.languages[0] is not guaranteed to equal navigator.language.
In Edge version 16 on 2017-10-17
In Firefox version 32 on 2014-09-02 Note: In Firefox, the navigator.languages property's value is taken from the intl.accept_languages preference.
In Firefox for Android version 32 on 2014-09-02 Note: In Firefox for Android, the navigator.languages property's value is taken from the intl.accept_languages preference.
Not in Internet Explorer Note: Closest available (non-standard) properties are userLanguage and browserLanguage.
In Quest Browser version 5.0 on undefined Note: Before Quest Browser 5.0, navigator.languages[0] is not guaranteed to equal navigator.language.
In Opera version 24 on 2014-09-02
In Opera Android version 24 on 2014-09-10
In Safari version 10.1 on 2017-03-27
In Safari on iOS version 10.3 on 2017-03-27
In Samsung Internet version 3.0 on 2015-04-10
In WebView Android version 37 on 2014-09-03 Note: Before version 65, navigator.languages[0] is not guaranteed to equal navigator.language.
In WebView on iOS version 10.3 on 2017-03-27