Sequence diagram demos

      sequenceDiagram
        accTitle: test the accTitle
        accDescr: Test a description

        participant Alice
        participant Bob
        participant John as John
Second Line
        autonumber 10 10
        rect rgb(200, 220, 100)
        rect rgb(200, 255, 200)

        Alice ->> Bob: Hello Bob, how are you?
        Bob-->>John: How about you John?
        end

        Bob--x Alice: I am good thanks!
        Bob-x John: I am good thanks!
        Note right of John: John thinks a long
long time, so long
that the text does
not fit on a row.

        Bob-->Alice: Checking with John...
        Note over John:wrap: John looks like he's still thinking, so Bob prods him a bit.
        Bob-x John: Hey John - we're still waiting to know
how you're doing
        Note over John:nowrap: John's trying hard not to break his train of thought.
        Bob-x John:wrap: John! Are you still debating about how you're doing? How long does it take??
        Note over John: After a few more moments, John
finally snaps out of it.
        end

        autonumber off
        alt either this
        Alice->>+John: Yes
        John-->>-Alice: OK
        else or this
        autonumber
        Alice->>John: No
        else or this will happen
        Alice->John: Maybe
        end
        autonumber 200
        par this happens in parallel
        Alice -->> Bob: Parallel message 1
        and
        Alice -->> John: Parallel message 2
        end
    

      sequenceDiagram
        accTitle: Sequence diagram title is here
        accDescr: Hello friends

      participant Alice
      participant Bob
      participant John as John
Second Line
      rect rgb(200, 220, 100)
      rect rgb(200, 255, 200)
      Alice ->> Bob: Hello Bob, how are you?
      Bob-->>John: How about you John?
      end
      Bob--x Alice: I am good thanks!
      Bob-x John: I am good thanks!
      Note right of John: John thinks a long
long time, so long
that the text does
not fit on a row.
      Bob-->Alice: Checking with John...
      Note over John:wrap: John looks like he's still thinking, so Bob prods him a bit.
      Bob-x John: Hey John - we're still waiting to know
how you're doing
      Note over John:nowrap: John's trying hard not to break his train of thought.
      Bob-x John:wrap: John! Are you still debating about how you're doing? How long does it take??
      Note over John: After a few more moments, John
finally snaps out of it.
      end
      alt either this
      Alice->>John: Yes
      else or this
      Alice->>John: No
      else or this will happen
      Alice->John: Maybe
      end
      par this happens in parallel
      Alice -->> Bob: Parallel message 1
      and
      Alice -->> John: Parallel message 2
      end
      

      sequenceDiagram
      participant 1 as multiline
using #lt;br#gt;
      participant 2 as multiline
using #lt;br/#gt;
      participant 3 as multiline
using #lt;br /#gt;
      participant 4 as multiline
using #lt;br /#gt;
      1->>2: multiline
using #lt;br#gt;
      note right of 2: multiline
using #lt;br#gt;
      2->>3: multiline
using #lt;br/#gt;
      note right of 3: multiline
using #lt;br/#gt;
      3->>4: multiline
using #lt;br /#gt;
      note right of 4: multiline
using #lt;br /#gt;
      4->>1: multiline
using #lt;br /#gt;
      note right of 1: multiline
using #lt;br /#gt;
      

      sequenceDiagram
      autonumber
      Alice->>John: Hello John,
how are you?
      autonumber 50 10
      Alice->>John: John,
can you hear me?
      John-->>Alice: Hi Alice,
I can hear you!
      autonumber off
      John-->>Alice: I feel great!
      

        sequenceDiagram
        box lightgreen Alice & John
        participant A
        participant J
        end
        box Another Group very very long description not wrapped
        participant B
        end
        A->>J: Hello John, how are you?
        J->>A: Great!
        A->>B: Hello Bob, how are you ?
        

      sequenceDiagram
      participant Alice
      participant Bob
      participant John
      par_over Section title
        Alice ->> Bob: Message 1
Second line
        Bob ->> John: Message 2
      end
      par_over Two line
section title
        Note over Alice: Alice note
        Note over Bob: Bob note
Second line
        Note over John: John note
      end
      par_over Mixed section
        Alice ->> Bob: Message 1
        Note left of Bob: Alice/Bob Note
      end
    

    sequenceDiagram
    participant 1 as $$\frac{\lim_{x\rightarrow0}{\frac{1}{x}}}{\frac{-b\pm\sqrt{b^2-4ac}}{2a}}$$
    participant 2 as $$\beta$$
    participant 3 as $$\delta$$
    participant 4 as $$\frac{\frac{\lim_{x\rightarrow0}{\frac{1}{x}}}{\frac{-b\pm\sqrt{b^2-4ac}}{2a}}}{\frac{\text{d}}{\text{d}x}{x^2}}$$
    1->>2: $$\sqrt{2}$$
    note right of 2: $$\frac{1+\frac{1+\frac{1+\frac{1}{2}}{2}}{2}}{2}+\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$
    2->>3: $$\frac{\lim_{x\rightarrow0}{\frac{1}{x}}}{\frac{-b\pm\sqrt{b^2-4ac}}{2a}}$$
    note right of 3: $$\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$
    3->>4: $$\lim_{x\rightarrow0}{\frac{1}{x}}$$;
    note right of 4: multiline
    4->>1: multiline
using #lt;br /#gt;
    note right of 1: multiline
$$\frac{1}{2}$$
3rd line
    

      sequenceDiagram
      autonumber
      participant 1 as $$\alpha$$lex
      participant 2 as $$\beta$$ob
      participant 3 as $$\theta$$iffany
      1->>2: Hello John, does  $$\frac{1}{2}+1=2$$?
      loop $$\frac{1}{2}+1=2$$
          2->>2: $$\frac{1}{2}+1=\frac{3}{2}$$
      end
      Note right of 2: $$x = \begin{cases} 1 &\text{if } \frac{1}{2}+1=2 \\ 0 &\text{if } \frac{1}{2}+1\ne2 \end{cases}$$
      2-->>1: $$\frac{1}{2}+1\ne2\implies 1$$
      2->>3: $$\frac{\text{d}}{\text{d}x}{3x^2+2x+1}$$
      3-->>2: $$6x+2$$