This example demonstrates how to build a smiley face using D3.js, with the ability to animate its eyebrows. It uses basic SVG elements—circles for the face and eyes, and a path generated by the `d3.arc` function for the mouth. The code sets up an SVG canvas and positions elements using translation and coordinate attributes. It relies on D3 v5’s selection and arc APIs to create the static face, which serves as a foundation for adding interactive or animated features.