This example demonstrates how to build a smiley face using D3.js v5, with interactive eyebrows that move. It uses basic SVG shapes and DOM manipulation through D3’s selection methods, appending circles and paths to a scalable vector graphic. The chart also incorporates a Sankey diagram layout, using d3.sankey to generate nodes and links, with gradient-colored edges and labels. The code relies on d3.create and d3.selectAll with data joins to dynamically render the visual elements.