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)

_setValue(this, value);
  }
  [$toHTML](availableSpace) {
    if (this.presence === "hidden" || this.presence === "inactive") {
      return HTMLResult.EMPTY;
    }
    fixDimensions(this);
    
    
    const savedW = this.w;
    const savedH = this.h;
    const { w, h, isBroken } = layoutNode(this, availableSpace);
    if (w && this.w === "") {
      
      
      
      
      
      
      if (isBroken && this[$getSubformParent]()[$isThereMoreWidth]()) {
        return HTMLResult.FAILURE;
      }
      this.w = w;
    }
    if (h && this.h === "") {
      this.h = h;
    }
    setFirstUnsplittable(this);
    if (!checkDimensions(this, availableSpace)) {
      this.w = savedW;