= new FormData(form);
  assert_equals(formData.get('n1'), null);
}, 'A disabled form-associated custom element should not provide an entry for it');

promise_test(async t => {
  let form = populateForm('<my-control name=d disabled></my-control>' +
      '<my-control name=e></my-control>');
  let query = await submitPromise(form, form.previousSibling);
  assert_equals(query.indexOf('d=my-control-value'), -1);
  assert_not_equals(query.indexOf('e=my-control-value'), -1);
}, 'A disabled form-associated custom 