code: function updateExistingItems(groupUi) {
      let itemUi = groupUi.firstElementChild
      while (itemUi) {
        updateItem(itemUi)
        itemUi = itemUi.nextElementSibling
      }
    }
docs: Updates all items in the provided UI container to reflect the current state of their associated options.
  
  @param {Element} groupUi The element containing the elements representing the UIs of the options.