Happy face
A yellow happy face is drawn on a white background, featuring two black eyes and a red smile. The SVG rendering uses primitive shapes: the head is a circle with a thick black stroke, the eyes are smaller filled circles, and the mouth is a path defined by a quadratic Bézier curve (using the `d` attribute with `M`, `Q`, and `Z` commands). No external data or JavaScript libraries are used; the design is static and hardcoded in the HTML markup.