Hidden

It is possible to add a block without showing it, for implementation details that would not interest the reader so much (they can still see them by enabling it in options).

```{lit} file:test.txt
To: You
From: Me
Body:
  {{Body (hidden)}}
```

```{lit} Body (hidden)
This is the message!
Note btw how when it spans on several lines the indentation
from the parent reference is propagated to all lines.

Regards,
{{Signature}}
```

```{lit} Signature
Me
```

HTML result

To: You
From: Me
Body:
  {{Body}}

This is the message!
Note btw how when it spans on several lines the indentation
from the parent reference is propagated to all lines.

{{Signature}}

Regards,
Me

Tangled result

Tangled block 'file:test.txt' [from here]

To: You
From: Me
Body:
  This is the message!
  Note btw how when it spans on several lines the indentation
  from the parent reference is propagated to all lines.
  
  Regards,
  Me