Fill and Stroke: Color, Gradient, Pattern, or None
SVG "Fill" and "Stroke" can be set with 4 fill types: "color", "linear gradient", "radial gradient", "pattern" or "none".
These coloring types can be assigned from the button bar at the top of the panel (see image below).
The icon in the center of the fill and stroke icon is for swapping the properties of the stroke and fill.
SVG gradients and SVG patterns are assigned for reference.
The "Clone" button allows you to create a copy.