This example shows a partial smiley face built with React and SVG, using d3’s `arc` function to define a mouth shape. Two black eye circles are placed symmetrically around a large yellow circle that has a thick black stroke, but the arcs are not yet rendered in the SVG output. The face uses fixed numeric coordinates for the center, eye offsets, and radii, with the mouth arc’s start and end angles set to draw only a quarter of a full circle.