1st PR
This example shows a set of seven large, semi-transparent circles arranged on a pale green SVG canvas, each with a distinct neon color and varying radius. The visualization demonstrates D3.js data binding and the General Update Pattern: an array of objects supplies x, y, radius, and fill values that drive circle creation through chained `attr` calls. The code uses `d3.select`, `join` to manage SVG and circle elements, and sets width and height from the container's client dimensions.