Mermaid语法测试

graph LR
   A --> B
   B --> C
   C --> A

timeline
    title History of Social Media Platform
    2002 : LinkedIn
    2004 : Facebook
         : Google
    2005 : YouTube
    2006 : Twitter

pie title Which animals do you prefer as pets?
    "Dogs" : 386
    "Cats" : 85
    "Rabbits" : 53
    "Hamsters" : 101