throws_dom('NotAllowedError',() => select1.showPicker(),'showPicker requires user activation');
  assert_false(select1.matches(':open'));
  await test_driver.bless('showPicker');
  select1.showPicker();
  assert_true(select1.matches(':open'));
  assert_equals(getComputedStyle(select1,'::picker(select)').appearance,'base-select');
  assert_equals(getComputedStyle(select1,'::picker(select)').backgroundColor,green,'now open, so popover-open matches');

  // Close the picker
  await clickOn(select1);
  assert_f