# Synthesia API Scripts

Synthesia API scripts support a set of HTML-like tags that let you control timing and pronunciation in generated videos.

## Quick Reference

| Tag   | Purpose                        | Example                                           |
|-------|--------------------------------|---------------------------------------------------|
| `<break>` | Insert a pause                | `Hello <break time="2s"/> world`                |
| `<sub>`   | Control pronunciation          | `<sub alias="Syn-the-zia">Synthesia</sub>`    |

## Insert Pauses with `<break>`

Use the `<break>` tag to add pauses or delays in narration:

- The `time` attribute accepts seconds (`s`).
- Works with all voices.

**Syntax:**

HTML

```html
<break time="1s"/>
```

**Example:**

Text

```text
Hello <break time="2s"/> world
```

## Control Pronunciation with `<sub>`

Use the `<sub>` tag to make the avatar say one word while displaying another as on-screen text:

- `alias` is what the avatar says.
- Inner text is what shows as captions.
- Behaves the same way as [SSML `sub`](https://www.w3.org/TR/speech-synthesis11/#S3.1.10).

**Syntax:**

HTML

```html
<sub alias="spoken text">caption text</sub>
```

**Example:**

Text

```text
The word is <sub alias="Syn-the-zia">Synthesia</sub>
```