This filter primitive creates a rectangle filled with the color and opacity values from properties flood-color and flood-opacity. The rectangle is as large as the filter primitive subregion established by the x, y, width and height attributes on the feFlood element.
For common properties see: filter_primitive
flood-color --
'currentColor'
| <color> [<icccolor>] |' inherit'
initial value is
'black'
flood-opacity -- <opacity-value> |
'inherit'
initial value is
'1'