flood-opacity

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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:

Example

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>

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
Filter Effects Module Level 1
# FloodOpacityProperty

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
flood-opacity

Legend

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Full support
Full support

See also