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).
const page = this.page;
    const rect = Util.normalizeRect([
      this.data.parentRect[0],
      page.view[3] - this.data.parentRect[1] + page.view[1],
      this.data.parentRect[2],
      page.view[3] - this.data.parentRect[3] + page.view[1],
    ]);
    const popupLeft =
      rect[0] + this.data.parentRect[2] - this.data.parentRect[0];
    const popupTop = rect[1];
    this.container.style.transformOrigin = `${-popupLeft}px ${-popupTop}px`;
    this.container.style.left = `${popupLeft}px`;
    this.container.style.top = `${popupTop}px`;
    this.container.appendChild(popup.render());
    return this.container;
  }
}
class PopupElement {
  constructor(parameters) {
    this.container = parameters.container;
    this.trigger = parameters.trigger;
    this.color = parameters.color;
    this.title = parameters.title;
    this.modificationDate = parameters.modificationDate;
    this.contents = parameters.contents;
    this.hideWrapper = parameters.hideWrapper || false;
    this.pinned = false;
  }
  render() {