fill-opacity

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨March 2020⁩.

The fill-opacity attribute is a presentation attribute defining the opacity of the paint server (color, gradient, pattern, etc.) applied to a shape.

Note: As a presentation attribute, fill-opacity also has a CSS property counterpart: fill-opacity. When both are specified, the CSS property takes priority.

You can use this attribute with the following SVG elements:

Usage notes

Value	`[0-1]` \| <percentage>
Default value	`1`
Animatable	Yes

Note: SVG2 introduces percentage values for fill-opacity, however, it is not widely supported yet (See Browser compatibility below) as a consequence, it is best practices to set opacity with a value in the range [0-1].