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">

return (
      this.hasOwnProperty(value[$nodeName]) &&
      this[value[$nodeName]].children.some(
        node => node[$content] === value[$content]
      )
    );
  }
  [$toHTML]() {
    const output = [];
    for (const child of this[$getChildren]()) {
      output.push(child[$text]());
    }
    return HTMLResult.success(output);
  }
}
class Keep extends XFAObject {
  constructor(attributes) {
    super(TEMPLATE_NS_ID, "keep",  true);
    this.id = attributes.id || "";
    const options = ["none", "contentArea", "pageArea"];
    this.intact = getStringOption(attributes.intact, options);
    this.next = getStringOption(attributes.next, options);
    this.previous = getStringOption(attributes.previous, options);
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.extras = null;
  }
}
class KeyUsage extends XFAObject {