Make slides configurable

[afeld]

Is your feature request related to a problem? Please describe.
I saw the announcement about showing notebooks as slides, which is great! That said, it seems to split the slides at somewhat arbitrary points, or following some pattern that isn't clear to me.

Describe the solution you'd like
I'd like the ability to specify slide breaks. Maybe could use the slide_type that Jupyter projects use? (Side note: Proposing that be added to the spec in jupyter/nbformat#419.)

Describe alternatives you've considered
I currently maintain the notebook locally and show as slides using nbconvert. It works, but the option to present from Colab directly (matching what my students use) would be nice!

Additional context
none

[cuffjosie]

Hello!

I assume you're talking about the custom metadata added by the Jupyter extension RISE. We are not able to use that extension in our frontend so we would need to build our own support for the metadata. What we launched was a simplified approach with no metadata editing.

We have this notebook that explains slideshow mode in Colab. The pattern is each cell is slide (slide type from the RISE extension), unless you have created a collapsible section in Colab that consists of one text cell and one code cell, then they are put together on a single slide (treated like fragments in RISE).

I've added b/456549004 internally to look into options for supporting RISE metadata out of the box (or at least a subset), but the underlying libraries and supported capabilities are fundamentally different.

If there is more to "getting cut off at arbitrary points" or specific examples of use cases you are trying to accomplish with the RISE metadata that are not well supported by the way we are breaking up the notebook, please follow up here!

[afeld]

Sorry for the terribly slow response.

That notebook is very helpful; the different approach from RISE makes sense. Given that explanation, my I suppose my request is now about documentation. Opened #5924. Thanks!