Markdown 速查表

# Heading 1

## Heading 2

### Heading 3

**bold text**

*italic text*

~~strikethrough~~

`inline code`

[link text](https://example.com)

![image alt](/favicons/favicon-96x96.png)

- Unordered item
- Another item

1. Ordered item
2. Another item

- Nested list
  - Sub-item 1
  - Sub-item 2

> Quote text

```javascript
const x = 1;
```

```python
def hello():
    print("Hello")
```

| Col1 | Col2 | Col3 |
|------|------|------|
| Data1 | Data2 | Data3 |

| Left | Center | Right |
|:-----|:------:|------:|
| Left | Center | Right |

---

***

$E = mc^2$

$\sum_{i=1}^{n} x_i$

$$\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi}$$

$$\frac{-b \pm \sqrt{b^2-4ac}}{2a}$$

$$\begin{pmatrix} a & b \\ c & d \end{pmatrix}$$

~~strikethrough text~~

| Header1 | Header2 |
|---------|---------|
| Cell    | Cell    |

- [ ] Incomplete task
- [x] Completed task

<kbd>Ctrl</kbd> + <kbd>C</kbd>

<mark>highlighted text</mark>

<sub>subscript</sub> and <sup>superscript</sup>

<em>emphasis</em> and <strong>bold</strong>