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)

$nodeName,
  $onChild,
  $onText,
  $removeChild,
  $searchNode,
  $setSetAttributes,
  $setValue,
  $tabIndex,
  $text,
  $toHTML,
  $toStyle,
  $uid,
  ContentObject,
  Option01,
  OptionObject,
  StringObject,
  XFAObject,
  XFAObjectArray,
} from "./xfa_object.js";
import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
import {
  addHTML,
  checkDimensions,
  flushHTML,
  getAvailableSpace,
} from "./layout.js";
import {
  computeBbox,
  createWrapper,
  fixDimensions,