flood-opacity

The flood-opacity attribute indicates the opacity value to use across the current filter primitive subregion.

[!NOTE] As a presentation attribute, flood-opacity also has a CSS property counterpart: {{cssxref("flood-opacity")}}. When both are specified, the CSS property takes priority.

You can use this attribute with the following SVG elements:

{{SVGElement("feFlood")}} and {{SVGElement("feDropShadow")}}

Example

css

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" filter="url(#flood1)" />
  <rect x="220" y="0" width="200" height="200" filter="url(#flood2)" />
</svg>

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.

Example

Usage notes

Specifications

Browser compatibility

See also