# themeRiverOpacity

Set as an HTML attribute or JavaScript property. type: number.

Canonical: https://chart.syidax.com/docs/options/themeRiverOpacity/

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## Definition

| Item | Value |
| --- | --- |
| JavaScript property | `themeRiverOpacity` |
| HTML attribute | `theme-river-opacity` |
| Type | `number` |
| Default | `1` |

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## Configuration example

```javascript
chart.themeRiverOpacity = 1;
```

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## Related documentation

A property with the same name may have different types and defaults across charts. When using a direct tag, follow that chart's documentation below.

- [Shared facade and direct tags](https://chart.syidax.com/docs/concepts.md)