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chromium/third_party/blink/web_tests/editing/spelling/spellcheck-reentry-crash.html 

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

<input id="target" type="text">

<script>
test(() => {
  assert_own_property(window, 'internals', 'This test requires window.internals');

  // Force layout update
  document.body.offsetLeft;

  target.focus();
  target.type = "password";

  // Spellchecker updates layout, which resets focus, which requests spellcheck.
  while (internals.idleTimeSpellCheckerState(document) !== 'Inactive')
    internals.runIdleTimeSpellChecker(document);

  // Shouldn't crash
}, "Should not crash if spellchecker attempts to re-entry");
</script>