ait new Promise(requestAnimationFrame);
  await new Promise(requestAnimationFrame);

  assert_equals(iframe.contentDocument.querySelector('select').value, 'two',
    'The selects value should be restored after navigating back.');
  assert_equals(iframe.contentDocument.querySelector('selectedcontent').innerHTML,
    iframe.contentDocument.querySelector('option[value=two]').innerHTML,
    'selectedcontent.innerHTML should match the selected <option>');
}, '<selectedcontent> should be up to date after form res