static get properties() {
    return {
      comboboxElement: Object,
      /**
       * Can be used to visually indicate the next
       */
      removeChipOnNextBackspace: Boolean,
      selectedChoices: Array,
    };
  }
Renders the wrapper containing the textbox that triggers the listbox with filtered options.
Optionally, shows 'chips' that indicate the selection.
Should be considered an internal/protected web component to be used in conjunction with
LionCombobox