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 also has a CSS property counterpart: flood-opacity. When both are specified, the CSS property takes priority.

You can use this attribute with the following SVG elements:

<feFlood> and <feDropShadow>

Example

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.