Common Markdown syntax

# Heading 1
## Heading 2
**bold**, *italic*, `code`
- bullet
- bullet
1. numbered
[link](https://defient.io)
```code block```
i

This preview uses a minimal renderer designed to illustrate Markdown's essentials safely. For production use (GitHub READMEs, documentation generators), choose a CommonMark-compliant library like marked, markdown-it, or cmark.