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The Matrix specification supports spoilers since version 1.1:

- [Spoiler messages at Client-Server API of Matrix Specification](https://spec.matrix.org/latest/client-server-api/#spoiler-messages)

My favourite Matrix clients FluffyChat and Nheko support spoilers when
the spoiler is formatted like `||Reason why this is a spoiler|Actually
spoilered text.||` It can be in-line and reasonless spoilers are just
`||spoiler goes here||`.

Element Web supports whole message spoilers through the `/spoiler` command.
I am not sure on other Elements as I barely use them for other things than
`/devtools` command.

Other clients supporting formatting such as Nheko older than [60b1a595e121e6d824cab188abac750be4459058](https://github.com/Nheko-Reborn/nheko/commit/60b1a595e121e6d824cab188abac750be4459058)
will have to enter the HTML directly such as:

```html
<span data-mx-spoiler="REASON HERE">Spoilered text</span>
```

Nheko has a `/plain` command to disable formatting for that message which
allows sending this message in plain text to help someone else.

```html
/plain <span data-mx-spoiler="REASON HERE">Spoilered text</span>
```

Spoilers are also supported by IRC, but not matrix-appservice-irc.

- [matrix-org/matrix-appservice-irc#1548: Feature request: bridge spoilers to IRC by sending them with the same background&foreground colour (and that to Matrix as spoiler)](https://github.com/matrix-org/matrix-appservice-irc/issues/1548)