Add special class to slide "fragments" (-- slides)

[sinedied]

It would be nice if slide fragments (slides starting with -- instead of ---) could be specifically identified, for example with a remark-fragment class and not just be regular slides, for multiple reasons:

• specific fragment animation vs whole slide transition
• pdf print exclusion of the whole fragments except the last one

I took a quick peek at the come, but at the moment it seems there is no way to simply distinguish full slides vs fragments, or maybe I missed something?

[wookayin]

Nice feature. Another suggestion: how about introducing a way to determine the fragment index (e.g. 1st or 2nd fragment out of total N fragments), by adding some classes (or an internal javascript API would be good as well)?

[szpak]

Somehow related to #294 and #297.

[bnicenboim]

I guess that if this is going to be added, it'll be nice that slide number won't increase when the next fragment appears.

[klonos]

it'll be nice that slide number won't increase when the next fragment appears.

Yeah, I was looking for a way to achieve that too.

[yihui]

@bnicenboim @klonos It turns out that there is an option countIncrementalSlides that can be set to false: https://github.com/gnab/remark/wiki/Configuration