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I can imagine the following uses for hidden `<details>` sections in comment threads. Some of these uses will apply to some types of Codidact community, and other uses will apply to other types. Even though not all communities will necessarily have a use for them, the fact that some communities will have some of these uses for them makes me in favour of hidden `<details>` sections being available in comments.

I don't see this as an urgent need, but it is something I would like to see in the long term.

## Long output such as log files
Sometimes information needs to be shared that would be disruptive to the flow of reading a comment thread if included at full length. For example, if a comment thread involves several comments back and forth helping narrow down which log file is required, there may be several comments each with pages long logs. If all of these show at full length then the reader needs to scroll down a long way to find the conclusion, even if they only need to see the latest log. Hidden sections would make it more convenient to help someone who isn't sure what information to include in their question, or who isn't sure how to apply the instructions given in an answer.

I can imagine this being relevant to the following communities:
- Software Development
- Code Golf
- Linux Systems
- Power Users

## Puzzle solutions
We don't yet have a Puzzles Codidact community, but there is [one in the Proposals community](https://proposals.codidact.com/posts/291378). Even before this is launched as a separate community, people are free to post questions and answers there to explore the scope, so being able to hide puzzle solutions during discussion threads could already be useful.

I can imagine this being relevant to the following communities:
- Puzzles
- Code Golf

## Spoilers
In addition to avoiding spoiling a plot point of a story (such as a movie or novel), it could also be useful to avoid giving away a full solution when giving a hint at how to solve a problem. Unlike puzzles, problems (whether in coding, cooking, or mathematics) tend to have multiple valid solutions, so hiding the writer's particular solution can allow the reader to find their own without being influenced, and then compare the differences.

I can imagine this being relevant to the following communities:
- Writing
- Software Development
- Code Golf
- Cooking
- Mathematics
- Physics
- Scientific Speculation
- Music