For creating a new SVG element, see svg.html.
Select an SVG element, click to add a new rectangle to the SVG element.
A new rectangle appears inside the SVG element:
You may move the rectangle to a desired location, change width and color of border, and change fill color. For details of these operations, see svg_polygon.html.
A rectangle is defined by its corner point (x, y), width and height. You may expand "rectangle" and modify these values:
You may specify hyperlink target and destination, and create highlighting effects. For details, see svg_polygon.html.