Attach (recommended) or Link to PDF file here: 

[anootation_problem.pdf](https://github.com/mozilla/pdf.js/files/7611701/anootation_problem.pdf)

Configuration:
- Web browser and its version: 98.0.4732.0 (Official Build) canary (64-bit)
- Operating system and its version: Edition Windows 10 Home, Version 20H2, OS build 19042.1348
- PDF.js version: 2.12.211
- Is a browser extension: Yes

Steps to reproduce the problem:
1. Open pdf file
2. Scroll to bottom of page and point to annotation of 'loss ft(x) >= 0,' text
3. Compare the displayed text with same in Acrobat Reader

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/2311076/143681452-0afa9a98-b16b-4a39-a393-631eb1c8c41f.png)

What went wrong? (add screenshot)
Text size not respected (e.g., in superscripts and subscripts)
![image](https://user-images.githubusercontent.com/2311076/143681575-2a2fe4de-cbad-4625-a6fe-2212fa20b8f1.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

$getChildren,
  $getParent,
  $globalData,
  $nodeName,
  $onText,
  $pushGlyphs,
  $text,
  $toHTML,
  XmlObject,
} from "./xfa_object.js";
import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
import {
  fixTextIndent,
  fixURL,
  measureToString,
  setFontFamily,
} from "./html_utils.js";
import { getMeasurement, HTMLResult, stripQuotes } from "./utils.js";
const XHTML_NS_ID = NamespaceIds.xhtml.id;
const $richText = Symbol();
const VALID_STYLES = new Set([
  "color",
  "font",
  "font-family",
  "font-size",
  "font-stretch",
  "font-style",
  "font-weight",
  "margin",
  "margin-bottom",