Where is the !!! warning syntax documented?

[astrojuanlu]

Hi folks! I see !!! warning and !!! note used in several places on the MkDocs documentation itself, but I don't see where are they documented. I expected to find it here https://www.mkdocs.org/user-guide/writing-your-docs/, along with the Markdown dialect that's used.

[Andre601]

This is not a direct mkdocs feature, but part of the Markdown library used called admonition.

Material for MkDocs has docs about it.
https://squidfunk.github.io/mkdocs-material/reference/admonitions/

[linxianmiao]

https://facelessuser.github.io/pymdown-extensions/
you can see this lib