The spec for this action:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2111850
An example of a form using this action:
https://www2.illinois.gov/rev/forms/reg/Documents/reg-1-mr.pdf
if (this.pinned) {
      this._hide(true);
    } else {
      this._show(true);
    }
  }
  /**
   * Show the popup.
   *
   * @private
   * @param {boolean} pin
   * @memberof PopupElement
   */
  _show(pin = false) {