nd.offsetTop, 50, 'legend.offsetTop');
  assert_equals(legend.clientHeight, 0, 'legend.clientHeight');
  const divChild = legend.firstChild;
  assert_equals(divChild.offsetLeft, fieldsetBorderWidth + 50, 'divChild.offsetLeft');
  assert_equals(divChild.offsetTop, 50, 'divChild.offsetTop');
}, 'in-fieldset-second-child');

test(() => {
  const legend = document.getElementById('in-fieldset-descendant');
  assert_equals(legend.offsetLeft, fieldsetBorderWidth, 'legend.offsetLeft');
  assert_equals(legend.offset