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---
title: flood-opacity
slug: Web/SVG/Attribute/flood-opacity
page-type: svg-attribute
browser-compat: svg.global_attributes.flood-opacity
---
{{SVGRef}}
The **`flood-opacity`** attribute indicates the opacity value to use across the current filter primitive subregion.
> [!NOTE]
> As a presentation attribute, `flood-opacity` can be used as a CSS property.
You can use this attribute with the following SVG elements:
- {{SVGElement("feFlood")}} and {{SVGElement("feDropShadow")}}
## Example
```css hidden
html,
body,
svg {
height: 100%;
}
```
```html
<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
<filter id="flood1">
<feFlood
flood-color="seagreen"
flood-opacity="1"
x="0"
y="0"
width="200"
height="200" />
</filter>
<filter id="flood2">
<feFlood
flood-color="seagreen"
flood-opacity="0.3"
x="0"
y="0"
width="200"
height="200" />
</filter>
<rect x="0" y="0" width="200" height="200" style="filter: url(#flood1);" />
<rect
x="0"
y="0"
width="200"
height="200"
style="filter: url(#flood2); transform: translateX(220px);" />
</svg>
```
{{EmbedLiveSample("Example", "420", "200")}}
## Usage notes
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td><code><alpha-value></code></td>
</tr>
<tr>
<th scope="row">Initial value</th>
<td><code>1</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
- `<alpha-value>`
- : A number or percentage indicating the opacity value to use across the current filter primitive subregion.
A number of `0` or a percentage of `0%` represents a fully transparent color, `1` or `100%` represents a fully opaque color.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{SVGAttr("flood-color")}}