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This interactive chart displays three time series—valueA, valueB, and valueC—as connected scatterplots over time. It includes lines, points, end labels, and a clickable legend that toggles the opacity of each series via `transition().style("opacity")`. The visualization uses D3 v6, loading CSV data from a URL, and leverages `d3.scaleLinear`, `d3.line`, `d3.axisBottom`, `d3.axisLeft`, and `d3.schemeSet2` for scales, paths, axes, and colors. Each series is rendered as an SVG path with circles marking individual data points.