after fieldset becomes uncheckable");
}, "when fieldset becomes uncheckable, so do its menuitems");

test(() => {
  const menulist = document.createElement('menulist');
  const fieldset = menulist.appendChild(document.createElement('fieldset'));
  fieldset.setAttribute("checkable", "multiple");
  const single1 = fieldset.appendChild(document.createElement('menuitem'));
  const single2 = fieldset.appendChild(document.createElement('menuitem'));

  single1.checked = true;
  single2.checked = true;
  fieldset.