The setting collapse="true" **does not** work in a revealjs presentation.

See code below:

:::{.callout-caution **collapse="true**"}
## Expand To Learn About Collapse

This is an example of a 'folded' caution callout that can be expanded by the user. You can use `collapse="true"` to collapse it by default or `collapse="false"` to make a collapsible callout that is expanded by default.

:::
2022-07-06T15:15:58Z
meersel
enhancement revealjs callouts
Future
open
collapse setting in callout block in a revealjs presentation not working
https://github.com/quarto-dev/quarto-cli/issues/1328