MathJax NBSP Cleaner: Auto Removing of "&nbsp" from Notes

AnkiWeb addon 126852831

Automatically detects and converts stray   characters in MathJax fields back to normal spaces on focus-out, including dynamically generated, shadow DOM, and iframe editors.
AI-generated summary; may contain mistakes.

formatting bugfix-workaround

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Votes: 0 (👍 0 · 👎 0)
Updated: 2026-10-10
Anki versions: 25.09~
License: Not found (this does not mean that the addon has no license)
Virus scan: No ClamAV match A match does not prove malware. No match does not prove that the code is safe.
Description language: en

Maintenance

active

Last update or commit: 2026-10-10 (22 days before the snapshot).

GitHub

No GitHub repository linked.

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Version branches

Min Anki	Max Anki	Updated
25.09	+	2026-10-10

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Description

MathJax NBSP Cleaner: Clean MathJax Formatting Automatically

When writing MathJax equations or editing formatted text, Anki's editor frequently writes double spaces into literal &nbsp; strings. This corrupts MathJax rendering and clutters formulas - incredibly frustrating when using LaTeX inside cards!

MathJax NBSP Cleaner silently runs in the background of your card editor, automatically detecting and converting &nbsp; characters back into normal spaces every time a field loses focus (before MathJax rendering triggers) by directly injecting raw HTML data.

Key Features

Automatic Focus-Out Cleaning: Sanitizes fields immediately upon unfocusing (focusout), right before MathJax re-renders your note preview.
Targeted MathJax Correction: Specifically targets escaped &nbsp; artefacts to restore proper LaTeX/MathJax expressions without altering unintended elements.
Deep Field Detection: Traverses regular DOM elements, shadow roots (Shadow DOM), and nested iframes to ensure every editor field is monitored simultaneously.
Dynamic Field Monitoring: Uses a MutationObserver to immediately attach cleaners to any dynamically generated fields without requiring an editor reload.
Native Change Dispatch: Emits native input events directly to the editor after sanitising, ensuring Anki registers and saves the corrected text instantly.
Duplicate Prevention: Built-in script and listener flags prevent duplicate observers and multi-firing event handlers.

Usage

No configuration, shortcuts, or menus required. Install the add-on, restart Anki, and edit your MathJax notes as usual—the cleaner functions completely automatically in the background.