This example uses D3 v7 to render a static composition of seven translucent circles on a fixed, full-window SVG canvas with a pale green background. The circles have varying radii and positions, each assigned a distinct bright fill color at 70% opacity. The code builds the visualization by binding an array of hardcoded circle properties—x, y, radius, and fill—to SVG circle elements, using D3’s `select`, `data`, and `join` methods. The canvas size adapts to the container’s client dimensions, and the styling comes from inline attributes rather than external data sources.