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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 can be used as a CSS property.

As a presentation attribute, it can be applied to any element but it has effect only on the following two elements: <feFlood> and <feDropShadow>

<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>

Usage notes

Value <alpha-value>
Initial value 1
Animatable Yes
<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

Specification Status Comment
Filter Effects Module Level 1
The definition of 'flood-opacity' in that specification.
Working Draft Aligned the value to the CSS <alpha-value> value.
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'flood-opacity' in that specification.
Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
flood-opacity ? ? ? ? ? ?
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
flood-opacity ? ? ? ? ? ?

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/flood-opacity