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)

"dimensions",
      "position",
      "presence",
      "border",
      "margin",
      "hAlign"
    );
    const classNames = ["xfaSubform"];
    const cl = layoutClass(this);
    if (cl) {
      classNames.push(cl);
    }
    attributes.style = style;
    attributes.class = classNames;
    if (this.name) {
      attributes.xfaName = this.name;
    }
    if (this.overflow) {
      const overflowExtra = this.overflow[$getExtra]();
      if (overflowExtra.addLeader) {
        overflowExtra.addLeader = false;
        handleOverflow(this, overflowExtra.leader, availableSpace);
      }
    }
    const isLrTb = this.layout === "lr-tb" || this.layout === "rl-tb";
    const maxRun = isLrTb ? MAX_ATTEMPTS_FOR_LRTB_LAYOUT : 1;
    for (; this[$extra].attempt < maxRun; this[$extra].attempt++) {
      if (isLrTb && this[$extra].attempt === MAX_ATTEMPTS_FOR_LRTB_LAYOUT - 1) {