I created a pdf for https://github.com/mozilla/pdf.js/pull/14023:
[same_fields(1).pdf](https://github.com/mozilla/pdf.js/files/7168340/same_fields.1.pdf)
The 3 checkboxes have the same name (`Check Box2`) and have the same values (`Off` and `Yes`).
In pdf.js, these checkboxes behave like radio buttons in the same group (which is wrong) because of:
https://github.com/mozilla/pdf.js/commit/1fcffe80349a98378262c8a16f7b50ff34c3fe82
Since they've the same values they must be synced: if one is checked (resp. unchecked) then all others are checked (resp. unchecked).
for (const coordinate of data.vertices) {
      const x = coordinate.x - data.rect[0];
      const y = data.rect[3] - coordinate.y;
      points.push(x + "," + y);
    }
    points = points.join(" ");
    const polyline = this.svgFactory.createElement(this.svgElementName);
    polyline.setAttribute("points", points);
    
    
    polyline.setAttribute("stroke-width", data.borderStyle.width || 1);
    polyline.setAttribute("stroke", "transparent");
    polyline.setAttribute("fill", "none");
    svg.appendChild(polyline);
    this.container.append(svg);
    
    
    this._createPopup(polyline, data);
    return this.container;
  }
}
class PolygonAnnotationElement extends PolylineAnnotationElement {
  constructor(parameters) {
    
    super(parameters);
    this.containerClassName = "polygonAnnotation";
    this.svgElementName = "svg:polygon";
  }
}
class CaretAnnotationElement extends AnnotationElement {