Sequence: Long Block Tab And Divider Labels

Long block and divider labels over adjacent participants: the gap between the participants widens so the label ends before the next lifeline.

sequence-long-block-tab-and-divider-labels.mmd
sequenceDiagram
  participant A
  participant B
  par a branch with a long descriptive title
    A->>B: x
  and another branch with an equally long title
    B->>A: y
  end
Output
Sequence diagram, Zombie Mermaid par [a branch with a long descriptive title] [another branch with an equally long title] x y A B

More Sequence diagram examples