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matrix-spec-proposals/proposals/2557-spoiler-clarifications.md

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MSC2557: Clarifications on spoilers

Spoiler messages are described in MSC2010 though the MSC is unclear if the fallback is required to be sent by clients.

Proposal

The fallback for spoiler messages is optional, though recommended to be sent by clients. Clients should make reasonable efforts to represent the spoiler in the body field of a message.

The recommended fallback format is unchanged.

Additionally, this proposal opens up spoilers to any HTML-supporting message types. Currently this includes m.text (already included by MSC2010), m.notice, and m.emote.

Potential issues

Clients could inadvertently spoil parts of a message by not representing the spoiler correctly in the body of the message. The author believes this would quickly show up as a bug report on the client due to the nature of spoilers.