CI Test Failing Around saveGif Documentation After Merging Markdown File

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build Process
• Unit Testing
• Internalization
• Friendly Errors
• Other (specify if possible)

p5.js version

n/a

Web browser and version

n/a

Operating System

n/a

Steps to reproduce this

Description

After merging This Markdown file, a CI test began failing. The issue seems to revolve around the saveGif documentation (see the log below).

Expected behavior

All CI checks should pass without errors after merging a Markdown file that is unrelated to codebase functionality.

CI Run Log

1 failing
  954 passing (39s)
  1) src/image/loading_displaying.js
       saveGif documentation
         example #1 works:
     TypeError: Cannot read properties of null (reading 'insertAdjacentHTML')
      at _main.default._describeHTML (http://localhost:9001/lib/p5.js:5[2184](https://github.com/processing/p5.js/actions/runs/6451897549/job/17513145355#step:5:2185):73)
      at _main.default.describe (http://localhost:9001/lib/p5.js:52034:18)
      at p5.draw (eval at <anonymous> (test-reference.html:36:11), <anonymous>:7:3)
      at p.<computed> (test-reference.html:153:27)
      at p.draw (test-reference.html:165:27)
      at _main.default.redraw (http://localhost:9001/lib/p5.js:70928:25)
      at _draw (http://localhost:9001/lib/p5.js:62374:23)

Warning: [object Object] Use --force to continue.

Aborted due to warnings.
Error: Process completed with exit code 3.

Full log: https://github.com/processing/p5.js/actions/runs/6451897549/job/17513145355

Start with the failing saveGif documentation example in src/image/loading_displaying.js and compare its CI traceback, especially the _describeHTML call and test-reference.html. Reproduce the unit-test failure and trace why the documentation example lacks the expected HTML context; done means the test passes and CI completes without errors.