A yellow smiley face rendered in SVG demonstrates core D3.js DOM manipulation and transitions. The code builds the face from basic shapes—circles for the eyes and head, a rectangular eyebrow, and an arc-generated mouth—anchored within a centered group. Using d3-selection and d3-transition, the eyebrows animate upward and back down over two sequential two-second intervals. The example shows how D3’s select, append, attr, and transition methods compose to create dynamic, interactive-style visuals without external data, relying purely on hardcoded geometry and SVG coordinates.