I have searched for any existing and/or related issues.
I have searched for any existing and/or related discussions.
I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
I am using the latest version of Open WebUI.
Installation Method
Git Clone
Open WebUI Version
v0.7.2
Ollama Version (if applicable)
No response
Operating System
Ubuntu24.04
Browser (if applicable)
No response
Confirmation
I have read and followed all instructions in README.md.
I am using the latest version of both Open WebUI and Ollama.
I have included the browser console logs.
I have included the Docker container logs.
I have provided every relevant configuration, setting, and environment variable used in my setup.
I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
Start with the initial platform/version/OS and dependencies used,
Specify exact install/launch/configure commands,
List URLs visited, user input (incl. example values/emails/passwords if needed),
Describe all options and toggles enabled or changed,
Include any files or environmental changes,
Identify the expected and actual result at each stage,
Ensure any reasonably skilled user can follow and hit the same issue.
Expected Behavior
Highlight MATLAB code
Actual Behavior
Unhighlighted MATLAB code
Steps to Reproduce
pass
Logs & Screenshots
Additional Information
No response
Originally created by @17Reset on GitHub (Jan 16, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/20719
### Check Existing Issues
- [x] I have searched for any existing and/or related issues.
- [x] I have searched for any existing and/or related discussions.
- [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
- [x] I am using the latest version of Open WebUI.
### Installation Method
Git Clone
### Open WebUI Version
v0.7.2
### Ollama Version (if applicable)
_No response_
### Operating System
Ubuntu24.04
### Browser (if applicable)
_No response_
### Confirmation
- [x] I have read and followed all instructions in `README.md`.
- [x] I am using the latest version of **both** Open WebUI and Ollama.
- [x] I have included the browser console logs.
- [x] I have included the Docker container logs.
- [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.**
- [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
- [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps:
- Start with the initial platform/version/OS and dependencies used,
- Specify exact install/launch/configure commands,
- List URLs visited, user input (incl. example values/emails/passwords if needed),
- Describe all options and toggles enabled or changed,
- Include any files or environmental changes,
- Identify the expected and actual result at each stage,
- Ensure any reasonably skilled user can follow and hit the same issue.
### Expected Behavior
Highlight MATLAB code
### Actual Behavior
Unhighlighted MATLAB code
### Steps to Reproduce
pass
### Logs & Screenshots
<img width="738" height="335" alt="Image" src="https://github.com/user-attachments/assets/62ecae1b-97b3-4f4a-8c5b-900d534623fa" />
### Additional Information
_No response_
@owui-terminator[bot] commented on GitHub (Jan 16, 2026):
🔍Similar Issues Found
I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:
#20632issue: Inconsistent behavior when editing section breaks. by jdwx • Jan 13, 2026 • bug
#20361Issue: Large-scale model setting-related functionality fails. by shentong0722 • Jan 04, 2026 • bug
💡Tips:
If this is a duplicate, please consider closing this issue and adding any additional details to the existing one
If you found a solution in any of these issues, please share it here to help others
This comment was generated automatically by a bot. Please react with a 👍 if this comment was helpful, or a 👎 if it was not.
<!-- gh-comment-id:3758685357 -->
@owui-terminator[bot] commented on GitHub (Jan 16, 2026):
🔍 **Similar Issues Found**
I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:
1. [#20632](https://github.com/open-webui/open-webui/issues/20632) **issue: Inconsistent behavior when editing section breaks.**
*by jdwx • Jan 13, 2026 • `bug`*
2. [#20361](https://github.com/open-webui/open-webui/issues/20361) **Issue: Large-scale model setting-related functionality fails.**
*by shentong0722 • Jan 04, 2026 • `bug`*
---
💡 **Tips:**
- If this is a duplicate, please consider closing this issue and adding any additional details to the existing one
- If you found a solution in any of these issues, please share it here to help others
*This comment was generated automatically by a bot.* Please react with a 👍 if this comment was helpful, or a 👎 if it was not.
I am able to reproduce this on the latest dev commit. Syntax highlighting for MATLAB code blocks CAN be added (see below)!
Root Cause
There are two separate issues preventing MATLAB syntax highlighting:
1. CodeEditor.svelte (editable code blocks)
The CodeEditor component uses CodeMirror for syntax highlighting. CodeMirror includes an Octave language (which is MATLAB-compatible), but it only registers 'octave' as an alias—not 'matlab'. The fix is to add 'matlab' as an alias:
// Add 'matlab' alias to Octave language (MATLAB-compatible syntax)
constoctaveLang=languages.find((l)=>l.name==='Octave');if(octaveLang&&!octaveLang.alias.includes('matlab')){octaveLang.alias.push('matlab');}
2. CodeBlock.svelte (read-only code blocks)
The non-editable code path uses highlight.js, which does support MATLAB. However, the current code incorrectly uses highlightAuto() with the language's aliases as hints: hljs.highlightAuto(code, hljs.getLanguage(lang)?.aliases).value
The problem is that hljs.getLanguage('matlab')?.aliases returns undefined (MATLAB has no aliases defined), so highlightAuto() receives no hints and may fail to detect MATLAB. The fix is to use highlight() directly when the language is recognized:
<!-- gh-comment-id:3764220473 -->
@silentoplayz commented on GitHub (Jan 17, 2026):
I am able to reproduce this on the latest `dev` commit. Syntax highlighting for MATLAB code blocks **CAN** be added (see below)!
## Root Cause
There are two separate issues preventing MATLAB syntax highlighting:
### 1. CodeEditor.svelte (editable code blocks)
The `CodeEditor` component uses CodeMirror for syntax highlighting. CodeMirror includes an **Octave** language (which is MATLAB-compatible), but it only registers `'octave'` as an alias—not `'matlab'`. The fix is to add `'matlab'` as an alias:
```js
// Add 'matlab' alias to Octave language (MATLAB-compatible syntax)
const octaveLang = languages.find((l) => l.name === 'Octave');
if (octaveLang && !octaveLang.alias.includes('matlab')) {
octaveLang.alias.push('matlab');
}
```
<img width="2560" height="372" alt="Image" src="https://github.com/user-attachments/assets/15092d1f-6d3e-4055-931d-a97baf8b4856" />
### 2. CodeBlock.svelte (read-only code blocks)
The non-editable code path uses highlight.js, which does support MATLAB. However, the current code incorrectly uses `highlightAuto()` with the language's aliases as hints:
`hljs.highlightAuto(code, hljs.getLanguage(lang)?.aliases).value`
The problem is that `hljs.getLanguage('matlab')?.aliases` returns `undefined` (MATLAB has no aliases defined), so highlightAuto() receives no hints and may fail to detect MATLAB. The fix is to use `highlight()` directly when the language is recognized:
```js
(hljs.getLanguage(lang)
? hljs.highlight(code, { language: lang })
: hljs.highlightAuto(code)
).value || code
```
<img width="2560" height="329" alt="Image" src="https://github.com/user-attachments/assets/0de8dae6-46e7-4214-aec3-23a9e19085ea" />
## End Result
<img width="2560" height="1271" alt="Image" src="https://github.com/user-attachments/assets/e5d1263d-268a-4cd1-a6b2-a1ddf49fdefc" />
Happy to submit a PR if this approach looks good!
<!-- gh-comment-id:3767460646 -->
@silentoplayz commented on GitHub (Jan 19, 2026):
Solved with https://github.com/open-webui/open-webui/pull/20773#event-22133767118 on the `dev` branch!
Blocking a user prevents them from interacting with repositories, such as opening or commenting on pull requests or issues. Learn more about blocking a user.
Originally created by @17Reset on GitHub (Jan 16, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/20719
Check Existing Issues
Installation Method
Git Clone
Open WebUI Version
v0.7.2
Ollama Version (if applicable)
No response
Operating System
Ubuntu24.04
Browser (if applicable)
No response
Confirmation
README.md.Expected Behavior
Highlight MATLAB code
Actual Behavior
Unhighlighted MATLAB code
Steps to Reproduce
pass
Logs & Screenshots
Additional Information
No response
@owui-terminator[bot] commented on GitHub (Jan 16, 2026):
🔍 Similar Issues Found
I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:
#20632 issue: Inconsistent behavior when editing section breaks.
by jdwx • Jan 13, 2026 •
bug#20361 Issue: Large-scale model setting-related functionality fails.
by shentong0722 • Jan 04, 2026 •
bug💡 Tips:
This comment was generated automatically by a bot. Please react with a 👍 if this comment was helpful, or a 👎 if it was not.
@silentoplayz commented on GitHub (Jan 17, 2026):
I am able to reproduce this on the latest
devcommit. Syntax highlighting for MATLAB code blocks CAN be added (see below)!Root Cause
There are two separate issues preventing MATLAB syntax highlighting:
1. CodeEditor.svelte (editable code blocks)
The
CodeEditorcomponent uses CodeMirror for syntax highlighting. CodeMirror includes an Octave language (which is MATLAB-compatible), but it only registers'octave'as an alias—not'matlab'. The fix is to add'matlab'as an alias:2. CodeBlock.svelte (read-only code blocks)
The non-editable code path uses highlight.js, which does support MATLAB. However, the current code incorrectly uses
highlightAuto()with the language's aliases as hints:hljs.highlightAuto(code, hljs.getLanguage(lang)?.aliases).valueThe problem is that
hljs.getLanguage('matlab')?.aliasesreturnsundefined(MATLAB has no aliases defined), so highlightAuto() receives no hints and may fail to detect MATLAB. The fix is to usehighlight()directly when the language is recognized:End Result
Happy to submit a PR if this approach looks good!
@silentoplayz commented on GitHub (Jan 19, 2026):
Solved with https://github.com/open-webui/open-webui/pull/20773#event-22133767118 on the
devbranch!