Fork of Circles with D3
This example demonstrates how to create and position circles using D3.js’s data join pattern. It renders a fixed dataset of seven circles, each with explicit x and y coordinates, radius, and fill color, onto an SVG canvas sized to its container. The code uses `select`, `selectAll`, `.data()`, and `.join()` to bind the data and generate circle elements, then applies attributes like `cx`, `cy`, `r`, `fill`, and `opacity` through method chaining. The visualization shows a colorful, overlapping composition with semi-transparent circles, highlighting basic D3 selection and rendering techniques.