This example shows a simple yellow smiley face drawn as a scalable vector graphic using D3 version 6. The face consists of a large yellow circle with two black eye circles and a mouth created via the `d3.arc` path generator. The SVG is initialized in an HTML file, and all shapes are appended programmatically using D3 selection methods like `svg.append` and `.attr`. The code demonstrates basic D3 shape construction and attribute manipulation without external data.