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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/browsing-context-names/choose-_blank-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: Browsing context - `_blank` name keyword</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
test(t => {
  var window1 = window.open('about:blank', '_blank');
  var window2 = window.open('about:blank', '_blank');
  var window3 = window.open('about:blank', '_blank');
  t.add_cleanup(() => {
    window1.close();
    window2.close();
    window3.close();
  });
  assert_not_equals(window1, window2);
  assert_not_equals(window2, window3);
  assert_not_equals(window1, window3);
}, 'window.open into `_blank` should create a new browsing context each time');

test(t => {
  var window1 = window.open('about:blank', '_bLAnk');
  var window2 = window.open('about:blank', '_bLAnk');
  var window3 = window.open('about:blank', '_bLAnk');
  t.add_cleanup(() => {
    window1.close();
    window2.close();
    window3.close();
  });
  assert_not_equals(window1, window2);
  assert_not_equals(window2, window3);
  assert_not_equals(window1, window3);
}, '`_blank` should be ASCII case-insensitive');
</script>