A smiley face rendered in green on an SVG canvas demonstrates basic DOM manipulation with D3.js v7. The face’s eyebrows move, though no animation logic is visible in the provided code. The example uses `select` from D3 to target the `<svg>` element and apply a background color, while the face itself is likely drawn through standard SVG shapes. It serves as a fork of a tutorial exercise focused on fundamental D3 selection and styling methods.