This example demonstrates a simple tooltip implemented as an SVG `<title>` element attached to a circle shape. The circle, with a radius of 200 pixels, is positioned at coordinates (250, 250) inside an SVG canvas of 960 by 500 pixels. The code uses D3 v6’s selection and `append` methods to create the circle and its child `<title>` node, which displays the static text “It Works” on hover. No data source is involved; the visualization relies entirely on D3’s DOM manipulation and SVG rendering.