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chromium/third_party/blink/web_tests/external/wpt/battery-status/battery-promise-window.https.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Battery Test: window.open() makes a different Navigator object</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://www.w3.org/TR/battery-status/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #note {
    background-color: #fef1b5;
    border: solid 1px #cdab2d;
    padding: 5px;
    margin: 15px;
    display: block;
  }
</style>
<div id="note">
  Allow pop-up windows before running the tests.
</div>
<div id="log"></div>
<script>
async_test(function (t) {
  var win = window.open('resources/support-window-open.html');
  window.onmessage = t.step_func(function(e) {
    assert_array_equals(e.data, [false, false, true]);
    win.close();
    t.done();
  });
}, 'window.open() makes a different Navigator object thus getting another battery promise');
</script>