A minimal D3 starter example demonstrates a basic data join by rendering 15 circles across the screen. The code uses `d3.select` and `d3.range` to generate data, then employs `selectAll`, `data`, `enter`, and `append` to create SVG circles with fixed radii. It runs entirely in the browser with a full-window SVG canvas, set against a plain white background. The example highlights the core enter selection pattern in d3 v7, with the bundled JavaScript file containing the import and logic.