For creating a new SVG element, see svg.html.
Select an SVG element, click to add a new circle to the SVG element.
A new circle appears inside the SVG element:
You may move the circle to a desired location, change width and color of border, and change fill color. For details of these operations, see svg_polygon.html.
A circle is defined by its center point (cx, cy) and radius r. Expand "circle" to set these values:
You may specify hyperlink target and destination, and create highlighting effects. For details, see svg_polygon.html.