The operator attribute for SVG specifies the compositing operation that is to be performed.
over | in | out | atop | xor | lighter | arithmetic
over
in
in2
k1
k2
k3
k4
World Wide Web Consortium (W3C)
The operator attribute for SVG specifies a keyword indicating whether to erode (thin) or dilate (fatten) the source graphic.
erode | dilate
erode
radius