This example displays a blank, purple visualization with three concentric circles centered within an SVG element. The circles are rendered using the SVG `circle` element, with the outer circle and two inner circles all having the same radius and position, creating a single overlapping shape. The code uses d3’s `select` and `svg.append` methods to build the graphic, while the `index.html` file loads the D3 library from a CDN. The page is styled with CSS to center text at a large font size, and the rendering approach relies on SVG primitives.