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The demo shown below was taken from the official Mermaid documentation.

sequenceDiagram
    participant Alice
    participant Bob
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts <br/>prevail!
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!

Textual representation

sequenceDiagram
    participant Alice
    participant Bob
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts <br/>prevail!
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!

^{The code above is rendered by "}^{Prism Syntax Highlighter for Confluence}^{" which supports highlighting Mermaid syntax.}

👉 Check out the official Mermaid documentation here https://mermaid.js.org/syntax/sequenceDiagram.html.