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chromium/third_party/blink/web_tests/intersection-observer/document-without-frame.html 

<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>

<style>
div {
  width: 100px;
  height: 100px;
}
</style>

<div id=target></div>

<script>
if (self.internals) {
  internals.DisableIntersectionObserverThrottleDelay();
}
async_test(t => {
  let observer = new IntersectionObserver(
    entries => {},
    {trackVisibility: true, delay: 100});
  let target = document.getElementById('target');
  observer.observe(target);
  let newdoc = document.implementation.createHTMLDocument("");
  newdoc.body.appendChild(target);
  target.parentNode.removeChild(target);
  requestAnimationFrame(() => {
    setTimeout(() => { t.done() });
  });
}, "Removing an IntersectionObserver target from a frameless document. Test passes if it does not crash.");
</script>