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

<!DOCTYPE html>
<meta charset=utf-8>
<title>Test for lack of indexed getter on Navigator</title>
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-navigator-object">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
test(function() {
  assert_false("0" in window.navigator);
  assert_equals(window.navigator[0], undefined);
}, "window.navigator[0] should not exist");
test(function() {
  window.navigator[0] = "pass";
  assert_true("0" in window.navigator);
  assert_equals(window.navigator[0], "pass");
}, "window.navigator[0] should be settable");
test(function() {
  assert_false("-1" in window.navigator);
  assert_equals(window.navigator[-1], undefined);
}, "window.navigator[-1] should not exist");
test(function() {
  window.navigator[-1] = "pass";
  assert_true("-1" in window.navigator);
  assert_equals(window.navigator[-1], "pass");
}, "window.navigator[-1] should be settable");
</script>