### Author:  [@jnavb](https://discuss.codemirror.net/u/jnavb)
#### Post date: [January 6, 2026, 7:00pm UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/1 "2026-01-06T19:00:13Z")
When using mixed languages, typing backtick (`) before `([{` inserts all sorts of incorrect values (see gif for more). `console.log()`.
I think this might be a bug, [here is an environment to reproduce](https://stackblitz.com/edit/codemirror-6-typescript-9whvdltc?file=client%252Findex.ts)
---
### Author:  [@marijn](https://discuss.codemirror.net/u/marijn)
#### Post date: [January 7, 2026, 7:53am UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/2 "2026-01-07T07:53:02Z")
I’m not seeing anything unexpected happen when I type a backtick before the parentheses in the demo you linked. What browser are you using? Are there any extensions enabled that might be interfering with the editor?
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### Author:  [@jnavb](https://discuss.codemirror.net/u/jnavb)
#### Post date: [January 7, 2026, 10:06am UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/3 "2026-01-07T10:06:58Z")
Found the issue, it happens for Spanish keyboard layouts.
From [Keyboard Event Viewer](https://w3c.github.io/uievents/tools/key-event-viewer.html)
**ES Layout**
**EN Layout**
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### Author:  [@marijn](https://discuss.codemirror.net/u/marijn)
#### Post date: [January 7, 2026, 10:33am UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/4 "2026-01-07T10:33:40Z")
I’m still not able to reproduce this, even with dead key backticks.
---
### Author:  [@jnavb](https://discuss.codemirror.net/u/jnavb)
#### Post date: [January 7, 2026, 10:47am UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/5 "2026-01-07T10:47:34Z")
I was able to reproduce it on two different macOS laptops. Here is more information about my device that I hope will be useful. I can also try later on a Windows machine.
OS: Tahoe 26.2 | Sequoia 15.7.3
Browsers: Chrome 143.0.7499.192 | Firefox 146.0.1 | Brave 1.85.118
Extensions: None
Keyboard layout `defaults read ~/Library/Preferences/com.apple.HIToolbox.plist AppleSelectedInputSources`
```auto
(
{
InputSourceKind = "Keyboard Layout";
"KeyboardLayout ID" = 87;
"KeyboardLayout Name" = "Spanish - ISO";
},
{
"Bundle ID" = "com.apple.PressAndHold";
InputSourceKind = "Non Keyboard Input Method";
},
{
"Bundle ID" = "com.apple.CharacterPaletteIM";
InputSourceKind = "Non Keyboard Input Method";
}
)
```
---
### Author:  [@marijn](https://discuss.codemirror.net/u/marijn)
#### Post date: [January 8, 2026, 9:34am UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/6 "2026-01-08T09:34:30Z")
The content in the screencast is different from the content in the demo you linked, but even if I create content resembling the screencast, I don’t see the issue occur.
---
### Author:  [@jnavb](https://discuss.codemirror.net/u/jnavb)
#### Post date: [January 8, 2026, 2:34pm UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/7 "2026-01-08T14:34:15Z")
Sorry, I forgot to save after changing the editor content. It should be easy to reproduce using the screencast information.
Here is some additional information based on tests I ran:
• It works as expected on Windows with the Spanish layout.
• I was able to reproduce the issue on a third macOS machine using both Firefox and Chrome
The issue appears to be real. Personally, I think it will not affect many users (macOS + Spanish layout + mixed languages), and it is something I can work around. I would therefore understand if the issue remains unresolved.
---
### Author:  [@marijn](https://discuss.codemirror.net/u/marijn)
#### Post date: [January 9, 2026, 9:00am UTC](https://discuss.codemirror.net/t/issue-when-using-mixed-languages-and-backtick-char/9645/8 "2026-01-09T09:00:29Z")
> [@jnavb](#):
>
> Personally, I think it will not affect many users (macOS + Spanish layout + mixed languages), and it is something I can work around. I would therefore understand if the issue remains unresolved.
It probably affects every type of composition, not just Spanish keyboard dead keys.
I was able to reproduce this, but only when using the outdated @codemirror/view from your demo. Upgrading to 6.39.9 removed the problem. So I think this was another symptom of [issue 1654](https://github.com/codemirror/dev/issues/1654).