Abbreviations plugin not working with Material for MkDocs

[leviofanh]

Context

Environment

• Material for MkDocs version: 9.5.49
• Python version: 3.12
• Operating System: Windows 10

Bug description

The Python Markdown abbreviations plugin (abbr) is not functioning correctly when used with Material for MkDocs.
Abbreviations are being rendered as plain text instead of creating the expected HTML abbreviation elements with tooltips.

Related links

Reporting a bug

The abbreviations extension is properly configured in mkdocs.yml and should work according to the:
Material for MkDocs documentation
and
Python Markdown documentation

Reproduction

9.5.49-abbreviations-plugin-not-working.zip

Steps to reproduce

1. Create a new Markdown file (e.g., test.md)
2. Add the following content to the file:

   [HTML]: HyperText Markup Language 

3. Configure mkdocs.yml with the following settings:

   site_name: Test Documentation
   theme:
     name: material
     
   markdown_extensions:
     - abbr

4. Run mkdocs serve
5. Open the page in a browser

Expected Behavior

When hovering over the "HTML" text, a tooltip should appear showing "HyperText Markup Language".

Actual Behavior

The abbreviation syntax [HTML]: HyperText Markup Language is rendered as plain text without creating the expected tooltip functionality.

Browser

No response

Before submitting

• I have read and followed the bug reporting guidelines.
• I have attached links to the documentation, and possibly related issues and discussions.
• I assure that I have removed all customizations before submitting this bug report.
• I have attached a .zip file with a minimal reproduction using the built-in info plugin.

[A3Bagged]

@leviofanh Downloaded and tested and turns out you had a false space before markdown-extensions: (not sure how they're called)

Wrong:

Right:

What i mean is there were 2 empty spaces before markdown-extensions: essentially putting it under theme:
markdown extensions need their own line, delete the 2 spaces and it works. Nothing faulty about the plugin, it was human error

If you're using VS Code there is a YAML extension that will show you the faults.

The [HTML]: HyperText Markup Language is the text that shows up

*[HTML]: HyperText Markup Language is essentially the "tooltip"

So the use case for it would be:

When hovering over the [HTML] tag you should see a tooltip.
*[HTML]: I am the tooltip

[squidfunk]

Thanks for investigating @A3Bagged – this is definitely related to a syntax error in the configuration.