circles
This example shows seven translucent circles of varying sizes and neon colors arranged on a light green background. The circles’ positions, radii, and fill colors are defined in a static data array, which is then rendered into SVG elements. The code uses D3’s `select`, `.selectAll`, and `.join` methods to create the SVG canvas and circles, and applies attributes like `cx`, `cy`, `r`, and `fill` via method chaining. The opacity is set uniformly to 0.708, allowing overlapping circles to blend visually.