HTML Starter
A smiling face rendered in SVG with animated eyebrows. Yellow circles form the head and eyes, while a D3 arc path shapes the smile. The eyebrows, built from rectangles, move up and down through chained `transition()` calls, altering their vertical transform over two seconds each. The example uses D3 v5 selection and arc API within a React framework, drawing directly to an SVG element defined in the HTML page.