alse in DATALIST');
  datalist.removeChild(control);
  assert_true(control.i.willValidate, 'remove from DATALIST');

  const fieldset = document.createElement('fieldset');
  fieldset.disabled = true;
  fieldset.appendChild(control);
  assert_false(control.i.willValidate, 'append to disabled FIELDSET');
  fieldset.disabled = false;
  assert_true(control.i.willValidate, 'FIELDSET becomes enabled');
  fieldset.disabled = true;
  assert_false(control.i.willValidate, 'FIELDSET becomes disabled');
  fieldset.remo