ect1.matches(':open'));
}, 'Basic functionality of select picker with appearance:none');

promise_test(async (t) => {
  const style = document.createElement('style');
  document.head.append(style);
  t.add_cleanup(() => style.remove());
  assert_equals(getComputedStyle(select1,'::picker(select)').appearance,'none');
  style.innerHTML = `
    #test1::picker(select) {appearance: base-select}
    #test1::picker(select):popover-open {appearance: auto}
    `;
  assert_equals(getComputedStyle(select1,'::picker(se