Syntax Reference

# Heading 1
## Heading 2
### Heading 3
#### Heading 4
##### Heading 5
###### Heading 6

**bold text**
*italic text*
==highlighted text==
H^2^O (superscript)
CO~2~ (subscript)
~~strikethrough~~

++underlined text++
++++double underline++++

> Quoted text
>
> Multiple paragraphs supported

1. First item
2. Second item
3. Third item

- First item
- Second item
  - Nested item

[[TOC]]

Use the `print()` function to output text.

```python
def hello():
    print("Hello, SoMarkDown!")
```

The mass-energy equation $E = mc^2$ is a cornerstone of physics.

Euler's identity: $e^{i\pi} + 1 = 0$

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

![semantic description](image URL)

![This chart shows exponential user growth from 2020 to 2024.](https://example.com/chart.png)

new SoMarkDown({ imgDescEnabled: true })

<table>
  <thead>
    <tr>
      <th>Column A</th>
      <th>Column B</th>
      <th>Column C</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td rowspan="2">Merged cell</td>
      <td>B1</td>
      <td>C1</td>
    </tr>
    <tr>
      <td>B2</td>
      <td>C2</td>
    </tr>
  </tbody>
</table>

: Figure 1 — User growth trend

![chart](chart.png)

The reaction $\ce{H2 + O2 -> H2O}$ is exothermic.

$$
\ce{CO2 + C -> 2 CO}
$$

$$
\ce{2H2 + O2 ->[\text{ignition}] 2H2O}
$$

Ethanol has the structure $\smiles{CCO}$.

$$
\smiles{c1ccccc1}
$$

$$
\ce{\smiles{CCO} + \smiles{O} -> \smiles{CC(O)O}}
$$

new SoMarkDown({
  smiles: {
    disableColors: false,
    width: 300,
    height: 200
  }
})

```mermaid
graph TD
  A[Start] --> B{Decision}
  B -->|Yes| C[Execute]
  B -->|No| D[End]
```