Callouts just got a lot more flexible in the latest release of Apex. I now support Quarto, Pandoc, Obsidian/Bear, and Python Markdown flavors of callouts.
Obsidian and Bear style still works
The original blockquote-style syntax is still first-class:
> [!NOTE] Heads up > This is a note.
That still renders to Apex callout HTML with type-aware classes and optional collapsible behavior…