The flood-opacity attribute indicates the opacity value to use across the current filter primitive subregion defined through the <feflood> element.
| Categories | Presentation attribute |
|---|---|
| Value | <opacity-value> | inherit |
| Initial value | 1 |
| Animatable | Yes |
| Normative document | SVG 1.1 (2nd Edition) |
The following elements can use the flood-opacity attribute
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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/flood-opacity