Ability to add annotations/comments in a code block as pictured.
Currently a new feature in MKDocs for Material:
Markdown format to achieve:
``` yaml
theme:
features:
- content.code.annotate # (1)!
```
  1. :man_raising_hand: I'm a code annotation! I can contain
    code
    , __formatted
text__, images, ... basically anything that can be written in Markdown.