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proposals/2010-spoilers.md

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 # MSC 2010: Proposal to add client-side spoilers
 Sometimes, while you want to put text into a spoiler to not have people accidentally read things that they don't want to see.
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 For example, when discussing a new movie or a TV series, not everyone might have watched it yet. In such cases it would make sense to add a spoiler so that only those who have seen the movie or don't mind spoilers read the content.  
 Another example would be e.g. in mental health communities where certain people have certain triggers. People could put talking about abuse or thelike into a spoiler, to not accidentally trigger anyone just reading along the conversation.  
 Furthermore this is helpful for bridging to other networks that already have a spoiler feature.
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 ## Proposal
 This proposal is about adding a new attribute to the `formatted_body` of messages with type `m.room.message` and msgtype `m.text`.
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 It adds a new attribute, `data-mx-spoiler`, to the `<span>` tag. If the attribute is present the contents of the span tag should be rendered as a spoiler. Optionally, you can specify a reason for the spoiler by setting the attribute string.
 
 The plain-text fallback could be rendered as `(Spoiler: <content>)` and `(Spoiler for <reason>: <content>)` respectively.