M = moveto
L = lineto
H = horizontal lineto
V = vertical lineto
C = curveto
S = smooth curveto
Q = quadratic Bezier curve (A Bezier curve with one control point)
T = smooth quadratic Bezier curveto
A = elliptical Arc
Z = closepath
Blur
Offset
The shadow is the alpha channel of the square
The shadow is the square which is blurred and has color changed.
The SVG