CSS fill-opacity Property Reference

The CSS fill-opacity property is a standard property in Scalable Vector Graphics. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

fill-opacity overview

The CSS fill-opacity property is a standard property in Scalable Vector Graphics. Review its formal syntax, computed behavior, and practical declarations.

The computed value normally inherits from the parent element when no declaration wins the cascade.

Syntax and formal definition

fill-opacity formal syntax

Field	Value
Formal syntax	<'opacity'>
Initial value	1
Applies to	limitedSVGElementsShapeText
Inherited	Yes
Percentages	mapToRange0To1
Computed value	specifiedValueNumberClipped0To1
Animation type	byComputedValueType
Media	visual
Specification group	Scalable Vector Graphics
Status	Standard

Practical examples

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

fill-opacity live example

CSS

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

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

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