This example demonstrates basic D3.js DOM manipulation by constructing a smiling face from SVG elements, with animated eyebrows that move independently. The code uses D3 v5 selection methods such as `select`, `append`, and `attr` to create a yellow circle for the face, while additional elements are styled via external CSS. The visualization renders in an SVG container with fixed dimensions, and the interaction is shown through a linked video tutorial. The approach highlights how D3 binds data to visual primitives without requiring a dataset, focusing instead on programmatic element creation and attribute updates.