Attach (recommended) or Link to PDF file here:
http://education.ohio.gov/getattachment/Topics/Special-Education/Preschool-Special-Education/ETR-Preschool-Planning-Form.pdf.aspx

- Web browser and its version: Firefox 89.0.1
- Operating system and its version: Windows 10 10.0.19043.1052
- PDF.js version: commit 5d251a3a3e7bfaa8fbfa07f0b7f9901eb3f999d9
- Is a browser extension: No

Steps to reproduce the problem:
1. Enable XFA support
2. Open form

What is the expected behavior? (add screenshot)
Shapes stay inside table cells
![image](https://user-images.githubusercontent.com/7104454/122572782-1252a580-d01c-11eb-9d0f-5fed46d6f2fe.png)

What went wrong? (add screenshot)
Shapes fall outside cells (among other issues)
![image](https://user-images.githubusercontent.com/7104454/122572885-2d251a00-d01c-11eb-8863-fa3b9969f0ea.png)

constructor(attributes) {
    super(TEMPLATE_NS_ID, "overflow");
    this.id = attributes.id || "";
    this.leader = attributes.leader || "";
    this.target = attributes.target || "";
    this.trailer = attributes.trailer || "";
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
  }
  [$getExtra]() {
    if (!this[$extra]) {
      const parent = this[$getParent]();
      const root = this[$getTemplateRoot]();
      const target = root[$searchNode](this.target, parent);
      const leader = root[$searchNode](this.leader, parent);
      const trailer = root[$searchNode](this.trailer, parent);
      this[$extra] = {
        target: (target && target[0]) || null,
        leader: (leader && leader[0]) || null,
        trailer: (trailer && trailer[0]) || null,
        addLeader: false,
        addTrailer: false,
      };
    }
    return this[$extra];
  }
}
class PageArea extends XFAObject {