Since the end of the last year it’s possible to add callouts to markdown files on GitHub. They are treated specially and rendered in a visually distinct way:

> [!NOTE]
> Highlights information that users should take into account, even when skimming.

> [!TIP]
> Optional information to help a user be more successful.

> Crucial information necessary for users to succeed.

> Critical content demanding immediate user attention due to potential risks.

> Negative potential consequences of an action.

In the spirit of xg2xg, this feature has a direct 1:1 mapping with the classic g3doc callouts at Google (except for “caution”):

Note: This is a note.

Tip: This is a tip.

Warning: This is a warning.

Important: This is important.