Several MD clients support this:

It generates a colored warning box that look like this syntax:

MDMonster disregards the ::: pair and simply shows the included text as is.

Is there some way to correct this?

We don't have built-in support for Admonition...

+++ Rick ---

Can you file an issue on GitHub, please?

Taking a look around it looks there might be a relatively easy solution by using this MarkDig addin:

https://github.com/ferrecromain/markdig-extension-bootstrap-admonitions

It'll have to be modified since MM doesn't use bootstrap explicitly but that's probably minor.

So, I've added basic support for Admonitions boxes in v3.5.24...

Based on DocFx styles, so the styling is different, but that can be customized via custom themes.

• Admonitions Extension

+++ Rick ---