CSS flood-opacity Property Reference

The CSS flood-opacity property is a standard property in Filter Effects. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

flood-opacity overview

The CSS flood-opacity property is a standard property in Filter Effects. Review its formal syntax, computed behavior, and practical declarations.

The property is not inherited by default. Use an explicit global keyword when inheritance is intended.

Syntax and formal definition

flood-opacity formal syntax

Field	Value
Formal syntax	<'opacity'>
Initial value	black
Applies to	limitedSVGElementsFloodAndDropShadow
Inherited	No
Percentages	no
Computed value	specifiedValueClipped0To1
Animation type	byComputedValue
Media	visual
Specification group	Filter Effects
Status	Standard

Practical examples

These declarations demonstrate valid ways to set flood-opacity. The initial and inherit global keywords remain available even when a property-specific value is preferable.

flood-opacity live example

CSS

.reset-example {
  flood-opacity: initial;
}

.inherit-example {
  flood-opacity: inherit;
}

@supports (flood-opacity: initial) {
  .supported {
    flood-opacity: initial;
  }
}