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
["change", "Action"],
          ["focus", "Focus"],
          ["blur", "Blur"],
          ["mousedown", "Mouse Down"],
          ["mouseenter", "Mouse Enter"],
          ["mouseleave", "Mouse Exit"],
          ["mouseup", "Mouse Up"],
        ],
        event => event.target.checked
      );
    }
    this._setBackgroundColor(element);
    this.container.appendChild(element);
    return this.container;
  }
}
class PushButtonWidgetAnnotationElement extends LinkAnnotationElement {
  render() {
    
    
    
    const container = super.render();
    container.className = "buttonWidgetAnnotation pushButton";
    if (this.data.alternativeText) {
      container.title = this.data.alternativeText;
    }
    return container;
  }
}
class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {