Reference Guide•CommonMark & GFM
Markdown & GFM Syntax Cheat Sheet
Everything you need to format text, write LaTeX formulas, build diagrams, and structure documents with Markdown.
Headings & Typography
Markdown Input
# Heading 1
## Heading 2
### Heading 3
**Bold Text** or __Bold Text__
*Italic Text* or _Italic Text_
~~Strikethrough~~
==Highlighted Text==
Rendered Result
Heading 1
Heading 2
Heading 3
Bold Text
Italic Text
Strikethrough
Code & Syntax Highlighting
Markdown Input
`inline code snippet`
```typescript
const greeting: string = "Hello, world!";
console.log(greeting);
```
Rendered Result
Use
inline code snippet in sentences.const greeting: string = "Hello, world!";\nconsole.log(greeting);
KaTeX Mathematical Formulas
Markdown Input
Inline: $E = mc^2$
Block equation:
$$
\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi}
$$
Rendered Result
Einstein's formula: E = mc²
∫ e-x² dx = √π
Mermaid.js Flowcharts & Diagrams
Markdown Input
```mermaid
graph LR
A[Input] --> B((Engine))
B --> C[Preview Output]
```
Input→Engine→Preview
GitHub Admonitions / Callouts
Markdown Input
> [!NOTE]
> Highlights essential information.
> [!WARNING]
> Critical alerts for caution.
NOTE
Highlights essential information.
WARNING
Critical alerts for caution.