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)

: new Corner({});
    const cornerStyle = corner[$toStyle]();
    const rect = {
      name: "rect",
      attributes: {
        xmlns: SVG_NS,
        width: "100%",
        height: "100%",
        x: 0,
        y: 0,
        rx: cornerStyle.radius,
        ry: cornerStyle.radius,
        style,
      },
    };
    return HTMLResult.success({
      name: "svg",
      children: [rect],
      attributes: {
        xmlns: SVG_NS,
        style: {
          position: "absolute",
        },
        width: "100%",
        height: "100%",
      },
    });
  }
}
class RefElement extends StringObject {