This interactive SVG smiley face renders a yellow circle with black eyes and a curved mouth, centered on a blank canvas. The face’s position follows mouse movement but remains docked at the screen center until clicked, at which point it becomes draggable. Built with React and D3 v6, the code uses D3’s `arc()` generator to shape the mouth path, while React state and event handlers manage the docking and repositioning logic. Eye and mouth dimensions are randomized per render, and the visualization uses a full-screen SVG without external data.