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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-datalist-element/input-text-datalist-removal.html 

<!DOCTYPE html>
<html class=reftest-wait>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://issues.chromium.org/issues/342660638">
<link rel=match href="input-text-focused-ref.html">
<link rel=assert title="Text inputs should reset their datalist related appearance when the list attribute is removed.">

<input list=mydatalist>
<datalist id=mydatalist>
  <option>option</option>
</datalist>

<script>
const input = document.querySelector('input');
(async () => {
  input.focus();
  await new Promise(requestAnimationFrame);
  input.removeAttribute('list');
  await new Promise(requestAnimationFrame);
  input.focus();
  await new Promise(requestAnimationFrame);
  document.documentElement.classList.remove('reftest-wait');
})();
</script>