CSS flood-opacity
原创flood-opacity
The flood-opacity CSS property defines the opacity of the current filter primitive subregion in <feFlood> and <feDropShadow> elements within a <filter>. If present, it overrides the element's flood-opacity attribute.
The property value impacts the flood-color's alpha channel; it can increase the transparency of a flood-color but can not make the color defined by the flood-color property more opaque.
Note:
The flood-opacity property only applies to <feFlood> and <feDropShadow> elements nested in an <svg>. It doesn't apply to other SVG, HTML, or pseudo-elements.
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