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The Matrix specification supports spoilers since version 1.1:

Automaattinen sisällysluettelo / Automatically generated Table of Contents

Best case scenario

My favourite Matrix clients, FluffyChat and Nheko, support spoilers when the spoiler is in the following format; ||Reason why this is a spoiler|Actually spoilered text.|| It can also be in-line and a spoiler without reason is just ||spoiler goes here||.

Element Web supports whole message spoilers through the /spoiler command.

Manual

Other clients supporting formatting may have to enter the HTML directly e.g.:

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

Some clients, like Nheko, have a /plain command to disable formatting for that message which allows sending this message in plain text to help someone else.

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

IRC

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

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