How can I hide block of text using YouTrack Markdown syntax?

Question

When I use YouTrack Wiki syntax, I can use {cut} like this:

{cut Block title}
Block content
{cut}

This is very useful feature, but Wiki syntax is deprecated and I can't find something similar in YouTrack Markdown syntax.

UPD: I figured out that I can use stacktrace as language with backticks:

```stacktrace
Header text
Hidden text
```

But it works different (possibly because it was designed to work with Java stacktraces), not preserving leading whitespaces, not highlighting code, etc.

Answer 1

In YouTrack 2019.3 it will be possible to use this (not tested personally yet):

<details>
  <summary>Brief summary</summary>
  Unnecessary long description
</details>

Implemented in https://youtrack.jetbrains.com/issue/JT-45636

Answer 2

On the subject of invisible notes, I use the following which do not show at all when using Markdown:

[//]: # (COMMENT DOES NOT SHOW)

This is great if doing a default description which needs some type of instruction.