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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/system-state-and-capabilities/the-navigator-object/navigatorlanguage.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>NavigatorLanguage: the most preferred language is the one returned by navigator.language</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#navigatorlanguage">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
  test(function() {
    assert_true("language" in navigator);
    assert_true("languages" in navigator);

    assert_equals(navigator.languages[0], navigator.language,
    "navigator.languages is the most preferred language first");

  });
</script>