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chromium/third_party/blink/web_tests/intersection-observer/observer-shared-from-iframe.html 

<body>
PASS if no crash.
<iframe id="i" src="resources/iframe-that-shares-observer.html"></iframe>
<script>
if (window.testRunner) {
  testRunner.waitUntilDone();
  testRunner.dumpAsText();
}

function move(d) {
  document.body.appendChild(d);
  i.remove();
  setTimeout(function() {
    if (window.testRunner)
      testRunner.notifyDone();
  }, 0);
}
</script>
</body>