atches(':enabled'));
  assert_false(control.matches(':disabled'));

  middleFieldset.appendChild(control);
  assert_false(control.matches(':enabled'));
  assert_true(control.matches(':disabled'));

  assert_array_equals(control.disabledHistory(), [true, false, true, false, true]);
}, 'Relationship with FIELDSET');

test(() => {
  const form = document.createElement('form');
  document.body.appendChild(form);
  form.innerHTML = '<my-control name="n1" disabled></my-control><input name="n2">'
  const formData 