() => style.remove());
  assert_equals(getComputedStyle(select1,'::picker(select)').appearance,'none');
  assert_equals(getComputedStyle(select1,'::picker(select)').backgroundColor,red);
  style.innerHTML = '#test1::picker(select) {appearance: base-select}';
  assert_equals(getComputedStyle(select1,'::picker(select)').appearance,'base-select');
  assert_equals(getComputedStyle(select1,'::picker(select)').backgroundColor,red,'still closed, so popover-open doesn\'t match');

  // Now open the picker
  assert_