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 p = document.createElement("p");
    const lines = contents.split(/(?:\r\n?|\n)/);
    for (let i = 0, ii = lines.length; i < ii; ++i) {
      const line = lines[i];
      p.appendChild(document.createTextNode(line));
      if (i < ii - 1) {
        p.appendChild(document.createElement("br"));
      }
    }
    return p;
  }
  /**
   * Toggle the visibility of the popup.
   *
   * @private
   * @memberof PopupElement
   */
  _toggle() {