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chromium/third_party/blink/web_tests/external/wpt/html/browsers/sandboxing/sandbox-disallow-popups.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>window.open in sandbox iframe</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<body>
<script>
setup({single_test: true});
// check that the popup's URL is not loaded
const uuid = token();
async function assert_popup_not_loaded() {
  const response = await fetch(`/fetch/api/resources/stash-take.py?key=${uuid}`);
  assert_equals(await response.json(), null); // is "loaded" if it loads
}

// check for message from the iframe
window.onmessage = e => {
  assert_equals(e.data, 'null', 'return value of window.open (stringified)');
  step_timeout(async () => {
    await assert_popup_not_loaded();
    done();
  }, 1000);
};
const iframe = document.createElement('iframe');
iframe.sandbox = 'allow-scripts';
iframe.srcdoc = `
  <script>
    let result;
    try {
      result = window.open('/fetch/api/resources/stash-put.py?key=${uuid}&value=loaded', '_blank');
    } catch(ex) {
      result = ex;
    }
    parent.postMessage(String(result), '*');
  <\/script>
`;
document.body.appendChild(iframe);
</script>