This example renders a simple static SVG scene containing a path, an inactive polygon with dashed gray styling, and a group of active and tentative shapes including a red circle and dark gray rectangle. The code relies on D3.js version 5.15.0 for element selection and class manipulation via `d3.select` and `.classed`. The SVG is drawn directly in the HTML with inline styling, showing how CSS classes like `.active` and `.tentative` control stroke appearance and opacity.