A smiley face with yellow circular head, black eyes, and a curved mouth is rendered in SVG using D3.js v5 and ES6 modules. The eyebrows are rectangular shapes that animate vertically via chained `transition()` calls, moving up and then returning to their original position over repeated 2-second intervals. D3's `select` and `arc` APIs construct the SVG elements, with layout driven by hardcoded dimensions from the parent `<svg>`.