I remember seeing a browser-based tool for doing "slideshows" that didn't display a slide at a time. Instead, "forward" and "backward" highlighted sections of point-form notes in a larger HTML page (slightly enlarged, drew a box around, etc.). I don't think it was just "preview" mode for a traditional slideshow tool but a thing in its own right. If anyone has a pointer, I'd be grateful for a share.

update: it wasn't Prezi - it was a little JS package that worked directly with HTML.

@gvwilson I remember it being super distracting 😂, without adding anything useful.