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)

if (caption.name === "div") {
        caption.name = "span";
      }
      ui.children.push(caption);
      return HTMLResult.success(html, bbox);
    } else if (this.ui.checkButton) {
      caption.attributes.class[0] = "xfaCaptionForCheckButton";
    }
    if (!ui.attributes.class) {
      ui.attributes.class = [];
    }
    switch (this.caption.placement) {
      case "left":
        ui.children.splice(0, 0, caption);
        ui.attributes.class.push("xfaLeft");
        break;
      case "right":
        ui.children.push(caption);
        ui.attributes.class.push("xfaLeft");
        break;
      case "top":
        ui.children.splice(0, 0, caption);
        ui.attributes.class.push("xfaTop");
        break;
      case "bottom":
        ui.children.push(caption);
        ui.attributes.class.push("xfaTop");
        break;
      case "inline":