# Editor is replaced by 'Invalid markdown provided' naming some other language

**What you are seeing**

The editor is replaced by 'Invalid markdown provided' naming some other language.

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## Why it happens

The renderer threw on the current text AND language detection guessed something other than markdown, HTML, Lua or unknown. A very code-heavy document can trip this.

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## What to do

Wrap large code sections in fences and remove anything that reads as another language at the top of the file.

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## Limits that apply here

| **Limit**                                | **Value**          | **What happens**                                                                                                                           |
| ---------------------------------------- | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------ |
| Macro title and description input length | 50 characters each | The macro config's 'Markdown title' and 'Markdown description' fields and the from-scratch editor's title field all stop at 50 characters. |
| Image load timeout                       | 15 seconds         | An image inside markdown that has not loaded in 15 seconds is replaced with '\[Image load timed out: …\]'.                                 |

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## A few things that catch people out

* Raw HTML is always stripped, in the editor preview, the viewer and the static-site export.

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## Related

[Saving a macro fails with 'Unable to save changes as the loaded markdown is not associated with theThe stored document belongs to a different page than the one you are editing. Typically af](https://help.gocapable.com/markdown/saving-a-macro-fails-with-unable-to-save-changes-as-the-loaded-markdown-is-not-associated-with-the.html)

[Freshly inserted macro sits on a placeholder for a long time before showing contentThe document exists but has not been indexed yet, so the macro retries every 15 seconds up](https://help.gocapable.com/markdown/freshly-inserted-macro-sits-on-a-placeholder-for-a-long-time-before-showing-content.html)

[Everything elseThe rest of this family.](https://help.gocapable.com/markdown/everything-else.html)

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