The gradientUnits attribute for SVG specifies the coordinate system for attributes x1, y1, x2, and y2.
objectBoundingBox | userSpaceOnUse
objectBoundingBox
gradientTransform
href
spreadMethod
x1
x2
y1
y2
World Wide Web Consortium (W3C)
The gradientUnits attribute for SVG specifies the coordinate system for attributes cx, cy, r, fx, fy, and fr.
cx
cy
fr
fx
fy
r