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 compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
flood-opacityChrome ? Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Compatibility unknown  
Compatibility unknown

See also