This example demonstrates a minimal D3 version 6 starter project, rendering two circles on an SVG canvas: a large yellow circle with a dark stroke and a small dark circle. The code uses d3-selection’s `select` and `append` methods to build the SVG elements, with circle attributes like `r`, `cx`, and `cy` set via method chaining. Positioning relies on percentage and pixel values, and the visualization is embedded in a full-viewport HTML page with a large font-size style.