test again mermaid

test again

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;

another test

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;

Another diagram

gantt
    title My Product Roadmap
    dateFormat  YYYY-MM-DD
    section Cool Feature
    A task           :a1, 2023-02-25, 30d
    Another task     :after a1, 20d
    section Rad Feature
    Task in sequence :2023-03-04, 12d
    Task, No. 2      :24d

refer to: https://css-tricks.com/making-mermaid-diagrams-in-markdown/