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)

return this[$extra].space || { width: 0, height: 0 };
  }
  [$toHTML]() {
    
    if (!this[$extra]) {
      this[$extra] = {
        numberOfUse: 1,
      };
    }
    const children = [];
    this[$extra].children = children;
    const style = Object.create(null);
    if (this.medium && this.medium.short && this.medium.long) {
      style.width = measureToString(this.medium.short);
      style.height = measureToString(this.medium.long);
      this[$extra].space = {
        width: this.medium.short,
        height: this.medium.long,
      };
      if (this.medium.orientation === "landscape") {
        const x = style.width;
        style.width = style.height;
        style.height = x;
        this[$extra].space = {