Q: Simultaneous animation of two code blocks

[lenianiva]

Is there a way to have the animation in two code blocks advance in lockstep? e.g. (replacing inner backtick with -)

---lean [1|2]
#check 1
#check "Hi"
---
---lean [1|2]
Nat
String
---

In the first frame, the two line 1's will be highlighted. In the second frame, the two line 2's will be highlighted.

[mfp22]

With JavaScript you can manually change fragment indexes and they'll run in parallel. Code snippet fragment indexes are automatically created, and I'm not sure if that can be changed declaratively. I hope there's a way, but I don't think so. So I've changed it with JavaScript in my slides and it's working. I actually made it a little more generic so I can reassign fragment ids in any slide with an html comment providing a simple map.