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 parent = this[$getParent]();
    let propName = "color";
    if (parent instanceof Border) {
      propName = "background";
    }
    if (parent instanceof Rectangle) {
      propName = "fill";
    }
    const style = Object.create(null);
    for (const name of Object.getOwnPropertyNames(this)) {
      if (name === "extras" || name === "color") {
        continue;
      }
      const obj = this[name];
      if (!(obj instanceof XFAObject)) {
        continue;
      }
      style[propName] = obj[$toStyle](this.color);
      return style;
    }
    if (this.color) {
      style[propName] = this.color[$toStyle]();
    }
    return style;
  }
}
class Filter extends XFAObject {