A yellow smiley face is drawn on an SVG canvas as a circle with eyes, eyebrows, and a mouth, built by manipulating DOM elements with D3.js v5. The code uses `select`, `append`, and `attr` to construct the shapes, and `transition` to animate the eyebrow group moving down and back up over a 4-second loop. The mouth is a path generated with the `arc` function, creating a curved shape from specified angles.