<!DOCTYPE html>
<p>This test verifies that moving an element to a different document during blur doesn't crash (see <a href="https://webkit.org/b/224957">bug #224957</a>).</p>

<div id="initial" tabindex="0">initial</div>
<div id="target" tabindex="0">target</div>
<iframe id="iframe"></iframe>

<script>
  if (window.testRunner)
    testRunner.dumpAsText();

  initial.addEventListener("blur", () => {
    iframe.contentDocument.body.appendChild(target);
  });
  initial.focus();
  target.focus();
  iframe.remove();
</script>