HTML Starter
This example shows a yellow smiley face rendered in SVG, with eyes and eyebrows that animate into a surprised expression over two seconds. The face is drawn by centering a group in the viewport, then appending a yellow circle, black eye circles, rectangular eyebrows, and a mouth path using the D3 arc generator. Transitions on the eyes, eyebrows, and fill colors drive the animation, while the page is set up with a minimal HTML file and D3 v5 loaded via script tag.