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)

const htmlValue = this.value[$toHTML]().html;
          if (htmlValue !== null) {
            value = htmlValue.children[0].value;
          }
        }
        if (this.ui.textEdit && this.value.text && this.value.text.maxChars) {
          ui.children[0].attributes.maxLength = this.value.text.maxChars;
        }
        if (value) {
          if (ui.children[0].name === "textarea") {
            ui.children[0].attributes.textContent = value;
          } else {
            ui.children[0].attributes.value = value;
          }
        }
      }
    }
    if (!caption) {
      if (ui.attributes.class) {
        
        ui.attributes.class.push("xfaLeft");
      }
      this.w = savedW;
      this.h = savedH;
      return HTMLResult.success(createWrapper(this, html), bbox);
    }
    if (this.ui.button) {
      if (style.padding) {
        delete style.padding;
      }