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---
title: stop-opacity
slug: Web/SVG/Attribute/stop-opacity
page-type: svg-attribute
browser-compat: svg.elements.stop.stop-opacity
---
{{SVGRef}}
The **`stop-opacity`** attribute defines the opacity of a given color gradient stop.
The opacity value used for the gradient calculation is the product of the value of `stop-opacity` and the opacity of the value of the {{SVGAttr("stop-color")}} attribute. For `stop-color` values that don't include explicit opacity information, the opacity is treated as `1`.
> [!NOTE]
> As a presentation attribute, `stop-opacity` can be used as a CSS property.
You can use this attribute with the following SVG elements:
- {{SVGElement("stop")}}
## Usage notes
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td>
<code
><a href="/en-US/docs/Web/SVG/Content_type#opacity_value"
><opacity-value></a
></code
>
</td>
</tr>
<tr>
<th scope="row">Default value</th>
<td><code>1</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
- `<opacity-value>`
- : This value is either a {{cssxref("number")}} between `0` and `1` or a {{cssxref("percentage")}} value specifying the opacity of the color gradient stop.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{SVGAttr("stop-color")}}
- {{SVGAttr("opacity")}}
- {{SVGAttr("fill-opacity")}}
- {{SVGAttr("stroke-opacity")}}