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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/embedded-opener.html 

<!doctype html>
<title>opener and embedded documents; using window.open()</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<iframe name=matchesastring></iframe>
<script>
async_test(t => {
  const frame = document.querySelector("iframe");
  frame.onload = t.step_func(() => {
    // Firefox and Chrome/Safari load differently
    if (frame.contentWindow.location.href === "about:blank") {
      return;
    }

    // Test bits
    assert_equals(frame.contentWindow.opener, window, "opener before setting it to null");

    const openerDesc = Object.getOwnPropertyDescriptor(frame.contentWindow, "opener"),
          openerGet = openerDesc.get;

    assert_equals(openerGet(), window, "opener before setting it to null via directly invoking the getter");
    frame.contentWindow.opener = null;
    frame.contentWindow.opener = "immaterial";
    assert_equals(openerGet(), null, "opener after setting it to null via directly invoking the getter");
    assert_equals(frame.contentWindow.opener, "immaterial");

    t.done();
  });
  window.open("/common/blank.html", "matchesastring");
});
</script>