Generators with a domain specific language to draw them:
[WINNER] Mermaid: https://knsv.github.io/mermaid/#activations
GitBook plugins for generating sequence diagrams:
Animate Sequence diagrams
This video suggests that someone accomplished this task, just not sure how, need to look deeper.
This gist again suggests that someone was able to animate the sequence diagram in
This issue doesn't have to do with animations but it suggests that people often embed and use sequence diagrams with