Github Markdown Flavor

• icons https://primer.github.io/octicons/
• About writing and formatting on GitHub
• 扩展
  • MathJax
  • 支持 mermaid, geojson, topojson, stl

Note This is a note

Warning This is a warning

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