\sqrt is rendered semi-invisible when Firefox is configured with custom colors (while High Contrast theme is set on Windows OS)
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Description
(UPDATE) Math renderer: chtml (svg renders correctly)
(UPDATE) Windows 10 theme: any High Contrast theme (used for accessibility feature)
Mathjax: 3.1.0
Browser: Firefox 80.0.1
Browser colors: (Text: white; Background: black)
Expression: (\sqrt[3]{4})
Numbers inside the square brackets (indices) are rendered invisible.

Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the expression \sqrt[3]{4} with the CHTML renderer in Firefox using a Windows High Contrast theme and custom white-on-black colors. Inspect the CHTML rendering and its styles; done means the index is visible in Firefox while the existing SVG rendering remains correct.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- css, html, javascript
- Domain
- accessibility, frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100