Attach (recommended) or Link to PDF file here:
https://web.archive.org/web/20210607145115/https://www.hsbc.fr/content/dam/hsbc/fr/docs/pib/Contestation-Transaction-Carte-Bancaire.pdf
(in the test corpus)

What is the expected behavior? (add screenshot)
<img width="175" alt="image" src="https://user-images.githubusercontent.com/942640/121593583-f8e4a480-c9f0-11eb-8901-2b3b63bb34c0.png">

What went wrong? (add screenshot)
<img width="124" alt="image" src="https://user-images.githubusercontent.com/942640/121593765-1a459080-c9f1-11eb-8695-461ef4e65c3d.png">

const [x, y, w, h] = bbox;
    this[$extra].width = Math.max(this[$extra].width, x + w);
    this[$extra].height = Math.max(this[$extra].height, y + h);
    this[$extra].children.push(html);
  }
  [$getAvailableSpace]() {
    return this[$extra].availableSpace;
  }
  [$toHTML](availableSpace) {
    
    const style = toStyle(this, "position");
    const attributes = {
      style,
      id: this[$uid],
      class: ["xfaArea"],
    };
    if (this.name) {
      attributes.xfaName = this.name;
    }
    const children = [];
    this[$extra] = {
      children,
      width: 0,
      height: 0,
      availableSpace,
    };
    if (
      !this[$childrenToHTML]({