A D3 tutorial demonstrates building a smiling face from SVG shapes, featuring animated eyebrows that raise and lower over four seconds. The code uses d3.arc to create the mouth path, while circles and rectangles form the eyes and eyebrows within a yellow circle. The eyebrows animate through chained transition.duration calls, moving their group’s transform attribute. Rendering occurs in an SVG canvas using d3.select and d3.append, with the final result displayed in a 960x500 viewport.